diff --git a/src/__tests__/format.test.ts b/src/__tests__/format.test.ts
index 0ca2a06..a0fc903 100644
--- a/src/__tests__/format.test.ts
+++ b/src/__tests__/format.test.ts
@@ -114,6 +114,20 @@ describe("formatWindowLabel", () => {
   it("returns Daily for 1440", () => {
     expect(formatWindowLabel(1440)).toBe("Daily")
   })
+
+  it("returns Monthly for 43200", () => {
+    expect(formatWindowLabel(43200)).toBe("Monthly")
+  })
+
+  it("returns Hourly for 60", () => {
+    expect(formatWindowLabel(60)).toBe("Hourly")
+  })
+
+  it("returns human-readable fallback for unknown durations", () => {
+    expect(formatWindowLabel(720)).toBe("12h")
+    expect(formatWindowLabel(2880)).toBe("2d")
+    expect(formatWindowLabel(30)).toBe("30m")
+  })
 })
 
 describe("getPercentColor", () => {
diff --git a/src/format.ts b/src/format.ts
index de8edb2..ea423a6 100644
--- a/src/format.ts
+++ b/src/format.ts
@@ -43,10 +43,16 @@ export function formatBar(
 
 export function formatWindowLabel(windowDurationMins: number | null | undefined): string {
   if (windowDurationMins == null) return "Unknown"
+  if (windowDurationMins === 60) return "Hourly"
   if (windowDurationMins === 300) return "Session"
-  if (windowDurationMins === 10080) return "Weekly"
   if (windowDurationMins === 1440) return "Daily"
-  if (windowDurationMins === 60) return "Hourly"
+  if (windowDurationMins === 10080) return "Weekly"
+  if (windowDurationMins === 43200) return "Monthly"
+
+  const totalHours = Math.floor(windowDurationMins / 60)
+  const days = Math.floor(totalHours / 24)
+  if (days > 0) return `${days}d`
+  if (totalHours > 0) return `${totalHours}h`
   return `${windowDurationMins}m`
 }