So one of these miners make 20EUR/day (on nicehash) and minus power cost . If I order now I will get a miner after two months. Can I count it will be profitable after a half of year? What is practice with other miners? (Sorry for bad eng.).
11.5 TH/s will generate about $18.29 USD a day at current BTC value, without any fees and without accounting for electricity, at 100% luck.
NiceHash isn't based on luck. It also charges at minimum a 2% fee.
There's no guarantee of anything in the mining world. BTC may go up. Difficulty will probably go up.
M