According to this calculator a black hole the size of the moon would take
584,745,000,000,000,000,000,000,000,000,000,000,000,000,000 years. I'm always open to correction though. (5.84745E44)
Any of the closed source ones I've used left me in an infinite loop where I'd get so far and end up back at the flicking through profiles stage. Maybe with open source I could figure out the problem.