For me i work on turn reward. So 10 per day. And winning per day, if i get lucky on random winning that is usually around 50. If not then ill just play bot and get around 15 coins.
10 + 30 = 40
1500 / 40 = 37,5 days
If i get random winning per day
10 + 60 = 70
1500 / 70 = 21,4 days
And if i get 2 random winning per day
10 + 100 = 110
1500 / 110 = 13,6
The longest day i can get is around 40 days assuming that i will get other things than coin for a reward