diff --git a/src/components/common/TransactionHistory.tsx b/src/components/common/TransactionHistory.tsx
index d8d835c..c1e8f26 100644
--- a/src/components/common/TransactionHistory.tsx
+++ b/src/components/common/TransactionHistory.tsx
@@ -69,18 +69,7 @@ const SAMPLE_TRANSACTIONS: Transaction[] = [
 	},
 ];
 
-const formatTimestamp = (timestamp: number) => {
-	const now = Date.now();
-	const diff = now - timestamp;
-	const minutes = Math.floor(diff / (1000 * 60));
-	const hours = Math.floor(diff / (1000 * 60 * 60));
-	const days = Math.floor(diff / (1000 * 60 * 60 * 24));
-
-	if (minutes < 1) return 'Just now';
-	if (minutes < 60) return `${minutes}m ago`;
-	if (hours < 24) return `${hours}h ago`;
-	return `${days}d ago`;
-};
+import { formatRelativeTime } from '@/utils/time.utils';
 
 const TransactionHistory: React.FC = () => {
 	const [isCompact, setIsCompact] = useState(() => {
@@ -186,7 +175,7 @@ const TransactionHistory: React.FC = () => {
 												<span className="text-white/30">•</span>
 												<span>{tx.price} XLM</span>
 												<span className="text-white/30">•</span>
-												<span>{formatTimestamp(tx.timestamp)}</span>
+												<span>{formatRelativeTime(tx.timestamp)}</span>
 											</div>
 										)}
 									</div>
@@ -256,7 +245,7 @@ const TransactionHistory: React.FC = () => {
 										<span className="text-white/30">•</span>
 										<span>{tx.price} XLM</span>
 										<span className="text-white/30">•</span>
-										<span>{formatTimestamp(tx.timestamp)}</span>
+										<span>{formatRelativeTime(tx.timestamp)}</span>
 										<span className="text-white/30">•</span>
 										<span>{tx.txHash}</span>
 									</div>
diff --git a/src/components/common/__tests__/TransactionHistory.test.tsx b/src/components/common/__tests__/TransactionHistory.test.tsx
index cc2ceec..9eb6179 100644
--- a/src/components/common/__tests__/TransactionHistory.test.tsx
+++ b/src/components/common/__tests__/TransactionHistory.test.tsx
@@ -51,4 +51,19 @@ describe('TransactionHistory – activity feed sign prefix (integration)', () =>
 			expect(amountEl!.textContent).toMatch(/XLM$/);
 		});
 	});
+
+	it('renders relative time label correctly for recent versus older events (#487)', () => {
+		render(<TransactionHistory />);
+
+		// SAMPLE_TRANSACTIONS has one from 30 minutes ago, one from 5 days ago (120 hours).
+		// We expect the first one to say "30 min ago" and the latter to say "5 days ago".
+		// Actually, let's just check for 'min ago' and 'days ago'
+		expect(screen.getAllByText(/min ago/)).not.toHaveLength(0);
+		expect(screen.getAllByText(/days ago/)).not.toHaveLength(0);
+		
+		// Ensure raw ISO timestamp is not shown
+		const isoRegex = /\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}/;
+		const rawTimestamps = screen.queryAllByText(isoRegex);
+		expect(rawTimestamps).toHaveLength(0);
+	});
 });
diff --git a/src/components/home/TrendingCreatorCard.tsx b/src/components/home/TrendingCreatorCard.tsx
index 9da2baf..e422fad 100644
--- a/src/components/home/TrendingCreatorCard.tsx
+++ b/src/components/home/TrendingCreatorCard.tsx
@@ -4,6 +4,7 @@ import { Link } from 'react-router';
 import type { Course } from '@/services/course.service';
 
 type Props = { creator: Course & { walletAddress: string } };
+import { formatHolderCount } from '@/utils/numberFormat.utils';
 
 export default function TrendingCreatorCard({ creator }: Props) {
 	const name = creator.title || 'Unnamed creator';
@@ -49,7 +50,7 @@ export default function TrendingCreatorCard({ creator }: Props) {
 						<div className="flex items-center gap-1.5 text-gray-400">
 							<Users className="size-3.5" />
 							<span className="font-mono text-[10px]">
-								{creator.creatorShareSupply.toLocaleString()}
+								{formatHolderCount(creator.creatorShareSupply)}
 							</span>
 						</div>
 					)}
diff --git a/src/components/home/__tests__/TrendingCreatorCard.integration.test.tsx b/src/components/home/__tests__/TrendingCreatorCard.integration.test.tsx
new file mode 100644
index 0000000..cc770b6
--- /dev/null
+++ b/src/components/home/__tests__/TrendingCreatorCard.integration.test.tsx
@@ -0,0 +1,55 @@
+import { render, screen } from '@testing-library/react';
+import { describe, expect, it } from 'vitest';
+import { MemoryRouter } from 'react-router';
+import TrendingCreatorCard from '../TrendingCreatorCard';
+import type { Course } from '@/services/course.service';
+
+const baseCreator: Course & { walletAddress: string } = {
+	id: 'test-1',
+	title: 'Test Creator',
+	description: 'Test Description',
+	price: 10,
+	instructorId: 'user1',
+	walletAddress: '0x123',
+	socialHandle: 'test',
+	category: 'Art',
+	level: 'Advanced',
+	createdAt: new Date().toISOString(),
+	updatedAt: new Date().toISOString(),
+	isVerified: false,
+	status: 'active',
+};
+
+describe('TrendingCreatorCard integration (#484)', () => {
+	it('formats holder count above 1000 with a K suffix', () => {
+		render(
+			<MemoryRouter>
+				<TrendingCreatorCard
+					creator={{
+						...baseCreator,
+						creatorShareSupply: 1500,
+					}}
+				/>
+			</MemoryRouter>
+		);
+		
+		expect(screen.getByText('1.5K')).toBeInTheDocument();
+		expect(screen.queryByText('1,500')).not.toBeInTheDocument();
+		expect(screen.queryByText('1500')).not.toBeInTheDocument();
+	});
+
+	it('shows the raw number for counts below 1000', () => {
+		render(
+			<MemoryRouter>
+				<TrendingCreatorCard
+					creator={{
+						...baseCreator,
+						creatorShareSupply: 999,
+					}}
+				/>
+			</MemoryRouter>
+		);
+		
+		expect(screen.getByText('999')).toBeInTheDocument();
+	});
+});
diff --git a/src/hooks/__tests__/useIsMobile.integration.test.tsx b/src/hooks/__tests__/useIsMobile.integration.test.tsx
index a1a0ae3..6c7b631 100644
--- a/src/hooks/__tests__/useIsMobile.integration.test.tsx
+++ b/src/hooks/__tests__/useIsMobile.integration.test.tsx
@@ -76,4 +76,11 @@ describe('useIsMobile integration (#485)', () => {
 		});
 		expect(screen.getByTestId('mobile-state')).toHaveTextContent('mobile');
 	});
+
+	it('cleans up the media query listener on unmount', () => {
+		const removeSpy = vi.spyOn(mql, 'removeEventListener');
+		const { unmount } = render(<MobileProbe />);
+		unmount();
+		expect(removeSpy).toHaveBeenCalledWith('change', expect.any(Function));
+	});
 });