It’s tried this free bitcoin cloud miner and I reached a minimum withdrawal of 10 USDT. I have withdrawn 10.34 USDT to storm gain’s wallet. You can’t withdraw these mined funds to another exchange or wallet. You can only trade with these mined funds and you can withdraw profit. So I opened trade, hope I get profit.
How long does it take to reach minimum withdrawal? it depends on you and the market prices. You need to activate the miner and come back after 4 hours and activate the miner again. So if you forget, it takes so long to reach 10 USDT. And bitcoin prices will changes so if the BTC price falls so down, it takes more time to reach 10 USDT.
IF you are interested, here is the Free Bitcoin Cloud Miner.