Allow time schedule based sync cycle end early

[e00E]

I would like to be able to configure the sync cycle duration to run until the sync is complete or a maximum time limit is reached. This is useful because I want the sync cycle to be as short as possible to save battery but I also want it to be as long as it needs to to get a full sync.

For example, I would like to be able to configure the sync cycle to run for at most 5 minutes and expect the following behavior:

• If the sync completes in 1 minute the sync cycle ends.
• If the sync does not complete in 5 minutes, the sync cycle is interrupted.

This might be how the setting already works in which case it just needs to be documented.

[TheKoTech]

Instead of turning sync on and off purely based on time, it could be better to keep sync on for N minutes after last change - either pulled from other devices or on the device. After N minutes of inactivity, start checking periodically: turn on for X minutes, turn off for Y minutes. On pull or file change, back to being on for N minutes.

That way the app won't turn off while files are being synced, battery is saved, the behavior is more configurable and consistent

[Today20092]

I'm also excited to see custom sync scheduling.

Another way that would be cool, but definitely not necessary, is sync on these specific days of the week at these times.