Always Late to Class? Stop Guessing When to Leave — Work Backwards Instead

The 9am lecture is a ten-minute walk away, you woke up at 8:30, and somehow you still slide into the back row at 9:07 with your shoes half-on. You weren't lazy about it. You just never got the one warning that used to arrive on its own — the voice from down the hall going "you're going to be late."

At home, someone else was your alarm system

For eighteen years, getting out the door on time wasn't really your job. A parent called up the stairs. A sibling was already in the car. The school bus came at a fixed minute whether you were ready or not, and the whole house was organised around not missing it. That was a scaffold — invisible, external, running quietly in the background of every morning.

College takes it all away in one weekend. Nobody knows your schedule. Nobody notices you're still in bed. The 9am doesn't wait, and there's no bus horn — just a room that fills up without you. The skill everyone assumes you already have, "leave at the right time," was actually being done *for* you the whole time. Now it's a question you have to answer yourself, several times a day, and it turns out to be a genuinely hard one.

"When do I actually need to leave?" is an invisible question

Time blindness means an ADHD brain runs on "now" and "not now" with very little in between. 9am is "not now" right up until it's suddenly *now* — there's no felt sense of the minutes draining toward it. So the question that decides whether you're on time — *when do I need to start moving?* — never gets asked, because the deadline doesn't feel like it's approaching until it's already here.

And even when you do try to plan it, the maths is stacked against you. "It's a ten-minute walk" quietly becomes the whole budget — as if you teleport from bed to the door. It ignores finding your other shoe, filling a water bottle, the bathroom, the fact your keys are somewhere. Getting-ready time is real time, and an ADHD brain reliably underestimates it, because the planning fallacy — imagining the smooth version where nothing goes sideways — hits harder here. You didn't budget wrong on purpose. You budgeted for a morning that has never once happened.

Put those together and "always late" isn't a character flaw. It's two invisible things — an approaching deadline you can't feel, and a prep window you always shortchange — colliding every single morning.

Leave By: start from when you need to arrive

Leave By is a Mac app that flips the whole calculation around. Instead of asking you to guess forward from now — *if I leave in a bit, will I make it?* — you tell it the one thing you actually know: when you need to arrive. 9:00, for the lecture across campus.

From there it works backwards. It takes your travel time and your prep time and subtracts them from the arrival time, then hands you two concrete moments: when to start getting ready, and when to walk out the door. The vague, unanswerable "should I be leaving soon?" turns into a specific clock time you can just obey — 8:38 start moving, 8:52 out the door. No felt sense of time required, because the app did the part your brain can't.

The point isn't a smarter countdown. It's that the two things that make you late — the deadline you can't feel and the prep time you don't count — are both handled *outside your head*. You stop doing time-math in a groggy 8:30 brain and just read the number.

Make catching your 9am automatic

The goal is that being on time stops depending on how you feel that morning. A few things make it stick:

1. Set it the night before, not the morning of. Deciding "arrive by 9:00" at 11pm is easy; deciding anything at 8:31 with one shoe on is not.
2. Be honest about prep time — time yourself for real one morning. If getting ready actually takes 22 minutes, tell it 22, not the fantasy 10. The app is only as good as the number you give it.
3. Obey the "start getting ready" cue, not just the "walk out" one. The reason you're late isn't leaving late — it's *starting* to get ready late. That first cue is the one that saves you.
4. For recurring classes, set them once and reuse them. Your Tuesday/Thursday 9am has the same arrival and the same walk every week; you shouldn't be re-solving it from scratch each time.

If the deeper problem is that you can't see your whole day coming — back-to-back classes, a shift, a study block all crashing into each other — that's a layout problem, and a visual day planner is the tool that makes the finite hours actually visible before you overbook them.

Squirrel apps are wellness tools, not medical devices, and don't diagnose or treat any condition.