Why do I have to jump start my car daily or multiple times a day?

What is your question?

I've replaced the battery, and had both the starter and alternator rebuilt, but after the car sits for a couple of hours or so I have to jump it to start it. I was told it could be the BCM but the only thing I'm sure of is that there seems to be an electrical drain of some sort even if I turn everything off when I get out of the car. What is causing this or what should I do next?

What makes this problem better or worse?

Sitting for more than an hour or two

How long has your 1995 Mercury Mystique had this problem?

A few months