A very simple idea
As my, soon to be ex, wife didn't like the dominant side a very simple idea we had to allow her to avoid decision making over lockup time was:-
She rolls the dice. For a 1,2,3 or 4 that s how many days I stayed locked and the dice was rolled on the next, 2nd,3rd 4th day afterwards. For a 5 or a six I was promised release in 5 or 6 days time. This simple game means I could never get release more often than every 5 days and this would involve some lucky dice rolling. Not clever enough to have ever done the maths but have just done 100 dice rolls and the release intervals were:-
9,10,5,8,8,36,6,16,5,17,5,10,7,7,6,20,6,10,36,9,6,10,5,6,13,6,12,8,6,9,9,5,6,8,12
If modified so that you only get out on throwing a 6 the release intervals were:-
9,67,6,38,15,7,33,6,10,51,10,24,6,12,8,6,9,20,8,18
Hope this helps
Maid Penny
PS the total is 363 days which is very close to a year so you get 35 and 20 releases a year respectively.