How the scheduler decides

Every replan runs the same steps, in the same order.

1. Reconcile with Google. Each block placed earlier is checked against the calendar. Moved by you, in the app or in Google: kept where you put it. Deleted by you: the task goes back to unscheduled.
2. Reading what is busy. Every calendar you count is read live, including ones shared as free/busy only and holiday calendars. All-day events block the whole day. Nothing from your calendar is stored.
3. Order the work. By priority first (urgent, high, medium, low), then by earliest deadline within a priority. A deadline never lets a low task jump an urgent one.
4. Place each task in the earliest gap that fits, inside your working hours and days, from now up to fourteen days ahead. A task you placed by hand keeps its time and the rest is laid out around it. A repeating task is placed once per occurrence, inside the period that occurrence falls in.
5. Split what is allowed to split, into blocks of at least thirty minutes. See Splitting long work.
6. Write only what changed. Blocks that did not move are not rewritten in Google, so your calendar does not churn.

Why a task is unscheduled

An unscheduled task shows its reason on its row. There are three:

• No duration. The scheduler cannot book a length it does not know.
• Deadline passed. Push the deadline out and it will be placed.
• No free slot before the deadline. Shorten it, allow splitting, extend working hours, or move the deadline.

When it runs

When you add or edit a task, change a setting, or press Schedule all. And in the background: Google tells Pensova when one of your calendars changes, and once an hour a job also checks each connected calendar. Either way the busy pattern is compared against a fingerprint of the last one it saw. If it changed — say a meeting landed on placed work — everything open is replanned. If nothing changed, nothing happens.