to win three in a row at even money its 7 to 1. to run 50 into 1000 is 19 to 1. but given say you are a better player than the field it may be less. but hitting the first few double ups is probably much greater than the 7 to 1 as you will mostly be against better hands. so the first couple of doubles, maybe your closer to 15 to 1 to triple up.

but if the game is tight and not alot of pressure you may easily double. so there.