I too would like to see the assignment of ownership last for at least seven days and possibly up to a year or more. This would make chastity control a real possibility.
That would really be great, because, for example, sometimes I go on holiday for 2 weeks and should be locked during that time whereas a month is too long because of security issues.
In case a completely free choice should be somehow impossible, the second best solution would be more possible settings like 3 days, 7 days, 2 weeks, one month, 3 months, 6 months or one year.