Allowing checked out licenses to linger for a set amount of time can be accomplished with an Options file. Lingering forces the Minitab License Manager to hold the checked out license for a set amount of time before returning it to the pool of available licenses. For example, if a user accidentally closes Minitab they will have this "lingering" time to reopen it before another user can check out this same license. For more information on Options files, click the link, FLEXnet Licensing End Users Guide, below.
To force licenses to linger use the following syntax:
LINGER minitab seconds
Note: You must specify the amount of time for a license to linger in seconds.