diff --git a/apps/server/src/cli/trace.test.ts b/apps/server/src/cli/trace.test.ts
index 6c00b240f0a71..521f06a70e48a 100644
--- a/apps/server/src/cli/trace.test.ts
+++ b/apps/server/src/cli/trace.test.ts
@@ -1,6 +1,6 @@
 import { assert, it } from "@effect/vitest";
 
-import { makeTraceSpanSummary } from "./trace.ts";
+import { formatTraceSummary, makeTraceSpanSummary } from "./trace.ts";
 
 const MINUTE_MS = 60_000;
 
@@ -62,3 +62,13 @@ it("reads failures and interrupts of browser spans from their OTLP status", () =
   const [render] = summarizer.finish().spans;
   assert.deepStrictEqual([render?.count, render?.interrupted, render?.failures], [4, 2, 1]);
 });
+
+it("prints durations that round up to a second in seconds", () => {
+  const summarizer = makeTraceSpanSummary();
+  [span("rpc", 999.4, MINUTE_MS), span("rpc", 999.6, 2 * MINUTE_MS)].forEach(summarizer.addLine);
+
+  const row = formatTraceSummary(summarizer.finish(), 25)
+    .split("\n")
+    .find((line) => line.startsWith("rpc"));
+  assert.deepStrictEqual(row?.trim().split(/\s+/).slice(3, 6), ["999ms", "1s", "1s"]);
+});
diff --git a/apps/server/src/cli/trace.ts b/apps/server/src/cli/trace.ts
index 3e94d0d9957f7..b2463dab0d98d 100644
--- a/apps/server/src/cli/trace.ts
+++ b/apps/server/src/cli/trace.ts
@@ -100,9 +100,9 @@ export function makeTraceSpanSummary(sinceMs = -Infinity) {
 }
 
 const formatMs = (ms: number) =>
-  ms < 1_000 ? `${Math.round(ms)}ms` : `${Math.round(ms / 100) / 10}s`;
+  Math.round(ms) < 1_000 ? `${Math.round(ms)}ms` : `${Math.round(ms / 100) / 10}s`;
 
-function formatTraceSummary(
+export function formatTraceSummary(
   summary: ReturnType<ReturnType<typeof makeTraceSpanSummary>["finish"]>,
   limit: number,
 ) {