diff --git a/src/client/state/zoom.ts b/src/client/state/zoom.ts
index a810a59..b2d2947 100644
--- a/src/client/state/zoom.ts
+++ b/src/client/state/zoom.ts
@@ -9,8 +9,17 @@
  * `prefs` stores the chosen value and the two must agree on what is valid.
  */
 
-/** The ladder, in px per day. Roughly a third wider at each step. */
-export const DAY_WIDTHS = [6, 9, 13, 20, 32, 48] as const;
+/**
+ * The ladder, in px per day. Roughly half again wider at each step.
+ *
+ * It runs from a quarter of calendar on one screen to a single day being wider
+ * than a finger. The close end is not decoration: several events routinely end
+ * within a day of each other, and at 48px a day their bar ends are a few pixels
+ * apart — which is the moment a reader is asking the board the one question it
+ * exists to answer, and being told to squint. Going in further separates them,
+ * and gives a one-day event a bar wide enough to read and to tap.
+ */
+export const DAY_WIDTHS = [6, 9, 13, 20, 32, 48, 72, 108] as const;
 
 /**
  * The scale the board opens at for a reader who has never touched the control.
diff --git a/test/zoom.test.ts b/test/zoom.test.ts
index a21060a..df09a0f 100644
--- a/test/zoom.test.ts
+++ b/test/zoom.test.ts
@@ -27,7 +27,7 @@ describe("snapDayWidth", () => {
     // close to what its reader chose.
     expect(snapDayWidth(10)).toBe(9);
     expect(snapDayWidth(7)).toBe(6);
-    expect(snapDayWidth(1000)).toBe(48);
+    expect(snapDayWidth(1000)).toBe(DAY_WIDTHS[DAY_WIDTHS.length - 1]!);
     // Exactly between two steps takes the wider one: ties go to the more
     // legible board.
     expect(snapDayWidth(11)).toBe(13);
@@ -56,6 +56,18 @@ describe("stepDayWidth", () => {
     expect(stepDayWidth(narrowest, -1)).toBe(narrowest);
   });
 
+  test("the close end goes past a week on screen", () => {
+    // Several events routinely end within a day of each other, and the reader
+    // has to be able to tell those ends apart — at 48px a day they are a few
+    // pixels between.
+    expect(canStep(48, 1)).toBe(true);
+    expect(stepDayWidth(48, 1)).toBe(72);
+    const widest = DAY_WIDTHS[DAY_WIDTHS.length - 1]!;
+    // A single day wider than a fingertip, so a one-day event is readable and
+    // tappable rather than the 34px minimum bar.
+    expect(widest).toBeGreaterThanOrEqual(96);
+  });
+
   test("canStep says when a control has nowhere left to go", () => {
     expect(canStep(DAY_WIDTHS[0]!, -1)).toBe(false);
     expect(canStep(DAY_WIDTHS[0]!, 1)).toBe(true);