Assume an online casino is offering a $20 deposit bonus with $1,000 play requirement. This would be a positive value promotion assuming a house edge of a half a percent. You should make $15 on it.

Now I'm wondering if there is a sweet spot for bet size for playing it. You could play it in one hand at a $1,000 a hand and would lose $1,000 over half the time or grind it out at $1 a hand over several hours. Is there a sweet spot somewhere in between which balances time and risk so you will most likely win?