Hi! Whenever you go into vacation it'll remove a minimum of 24 hours from your time bank and add it back onto the game that triggered vacation. So you'll see the game after this has happened- the 20 hours- even though it was at ~90 minutes when auto-vacation triggered.
So you can't use minute increments- to avoid using vacation to manage game load, you may want to work to reduce your number of games or play at higher time per move, if simply being cognizant of the rule is not enough to help you manage the games from here onward.
I have been put on automatic, involuntary vacation twice (at least) because (supposedly) I had only 30 minutes left to move. In all cases, I did not have so little time. Once I had 20 hours. Most recently I had moved and my opponent put himself on vacation apparently when he had 32 minutes to play. In addition, I no longer use up vacation time in minutes, but only in days. This is a very big problem for me. What can I do to have my account's proper amount of vacation restored and also return to minute increments?