I just installed Membership Pro and am carrying out initial testing. I noticed that if I create a plan where the Subscription Length is set to X minutes (purely for testing where X is any value greater than zero), when I look at the plan in the front end I notice that the payment terms value shows "X Days", rather than "X Minutes".
I have checked in the Translation area and see no particular reason why this is happening. I've attached a couple of screenshots for your reference. Is this something which is fixable at this end or do you need to dig in a little bit?
Don't setup Minutes for recurring plans like that, it is not supported by payment gateway. It needs to be at least Day, and that's the reason we do not adapt code for that step to support minutes (that is not allowed)