Indefinitely = Turn off/on options
It would be nice if the Indefinitely could be an option that could be turned off and not something that has to be selected to turn off for each device, but an overall setting. We have devices we are checking in and out on almost a daily basis and would be nice if you didn't have select that option
Have a look at Settings -> Company Policy -> Default Return Date and Time
Here you can define default return period for assets. For example; if you enter 1 in day and 1500 in time, on check out form the return date will be pre populated (1 day from the checkout date and return time will be 1500 hours).
If you have 0 in days and time is empty, 'checked out indefinitely' will be selected by default.
Do let us know if this works for you.