Roeland Still, Chani's maths is still not far off. When you look at the walkthrough, you notice that you start with 5 ingredients( I'm not counting the chilis) from the restaurant. Since the kitchen is refreshed every 4 hours, on a 16-hour day, you get 5 more items. On the seventh day, you only can get 35 more items. But as I noted just a few lines up, some rewards are not cooking items, so according to the walkthrough again, you can only get 20 more items during the week, so you can only cook with 25 items, and that's on day 4 at best and not before.
Now from an other perspective, the cooking is also refreshed every 4 hours, so you can refresh 35 times, plus the 5 tickets. In the end, you can cook 40 times during the week. 90 000 pots divided by 40 = 2250 pots per cooking on average. That is not very likely to happen. So either the reward pots you get on certain spins must be very high or the nice equipments are only available if you spend some gems...