It need not be per hour. You're right in pointing out the challenges of making it per hour. But that also should best be considered a metered model instead. And

It need not be per hour. You're right in pointing out the challenges of making it per hour. But that also should best be considered a metered model instead. And that could easily be annoying considering its too close to a show/movie run length. I was thinking monthly as that is the usual billing interval. Minimum 1 month subscriptions, then pause the next month if you want to be busy for example. Maybe even weekly or 24 hours would do.