Thats a bad question, you know some of these tama freaks would do something like that. better question is to ask how fast. I can get 2,000p in like about as little as 20 mins playing slots as I've found out how to predict (as best as I can) when to stop to get the O. Sometimes its a two count interval. If you watch it carefully you'll see it. Of course the pattern changes once and awhile but again you can sometimes see it, but yeah.
Anyways, max I got was 6,500-7,000p. Didn't really care to go further, nowadays I don't even try to go any higher than 4-5,000p, cause excessive cash is just being greedy and you must be pretty lifeless to do all that. As always, its just a game. Hope no one here is willing to give their life up for their tama pet, just a thought.
Best way to get money: Give your tama hella snacks, max if you want, put the bet on 9p, can just keep pressing B, but at slightly different times, cause if you press it too fast you'll probably get the X more because again its patterns, so wait a second then press B, then waight 2-3 and press it again, etc. You don't even have to look at it. Just watch a movie or whatever and do that. Your gain is a lot more than your loss.