This is a betta forum, you will get little to no response here.
Try logging on to Tropicalfishkeeping.com - it's the "mother" of bettafish.com. You can use the same name in both forums. TFK has a livebearer section where you will get more response on mollies or any other livebearers - about care, breeding, etc.
You can also go to bettafish from the TFK forum
Livebearers can store sperm for a few months. They only need to spawn once and will probably give birth every month. I once had a guppy that gave birth 6 times (6 months) before she stopped. My mollies were without male only for 3 months so I can't say how long she before she stops.
Mollies give birth monthly up to 15 - 40 fry (depending on their size). After the first day, fry are fairly independent and will eat almost anything you feed them. Unlike betta fry, livebearer fry is very adaptive. Just don't over feed and foul up the water. They are easy to keep and grow and before you know it, they will reproduce like crazy.