with fixed price and limited ths they give you more hashing power, imo to burn thru the coins faster (sorry I am a bit of C.T.)or am i the only one that happens to

Yeah it does seem like my next experiment should be less hashrate for a longer-term, eh? It looked to me like you could only place 24-hour long orders. Am I missing where you can rent for longer? Or do you just have to go in every day and "re-up" before the order ends, to keep it runnng for, say, a week?
Long or short has the same "expected" outcome.
Shorter means luck has "more" effect on the outcome.