jiizzz ! They don't give me enough infos before renting, damn !
OK, would you give me a good strategy about mining duration? How much time have I to mine for interesting payout?
Last renting 24h solution burn me 30$US for 7.8TH/s, the goal may be to test wich device is most efficient before to buy it.
Any opinion, please?
Renting here would be rough. It'll take ~15 days to reach full payout for any block that is found.
M
Well renting anywhere is not a solution

When we were 200PHs at the end of October, the largest miner (and I) rented a total of approx 100PHs from Nice hash.
I lost 50% (1.5 BTC) he lost a very large amount more.
Why? Coz the blocks found during that rental period (last 2 weeks of October) were the worst luck of all time on the pool (probably worse than any other pool in recorded history - but only for that short period of time)
Why? Well either it was just bad luck, or there was a problem with the rental (nicehash) they were more than 50% of the pool.
The statistics available are not large enough to determine which is the case, but they were very close to being unlikely to be just bad luck.
I recently checked the prices on MRR and they were WAY above the best expected mining return you could ever consider.