That subject is not a "quick question". Inventory control and whether a movie "has legs" is the essence of your business plan from moment you plan a production.

It's the equivalent to asking a Broadway producer upfront for a definitive answer as to how long a show will run. There are no rules.

Consider how Disney purposely puts titles into the vault until a new generation comes up that hasn't seen it. They re-release it in limited edition, then put it back in the vault.

On the other hand, there is a lot of porn (and mainstream movies) that are cranked out just to exploit the first run followed by being lost in obscurity.

Both options are valid ways to make money, it just depends on your plan.