I've been happy with the 1/2 hours, I try and get them done quicker, though if it isn't going my way doubling up takes the bets to high figures faster. I'm not betting high amounts yet. Sometimes I win twice in the first hour, if it looks close at the 1/2 past and you put the double up on, if it is close but I'm winning I will leave the second bet on and hopefully win the second 1/2 hour also, I only do this though if it is early in the night.