As far as I observed, right now, resets (e.g. for Priority Assignments) happen 24h after completion of the last related activity. This might cause problems if players have different free time periods to play each day. For example, today I had time to play in the evening, and I did all 3 Priority Assigments. However, the next day, I can only play in the mornign, meaning that I cannot complete Priority assignments taht day, as they are not reset yet, and I don't have time in the afternoon to play after they reset.
So, it would be better if resets like these would happen at midnight each day, making it possible to utulize more diverse playtime periods.