hello, how long will it take to get the first reward for a started mastering session, my mastering has been online and active for 1 day and 20 hours now
Masternodes rewards are by chance (read more about the odds here
https://magnetwork.io/2018/02/26/masternode-rewards-in-question/). Most will be in the middle of the bell curve but sometimes you'll be very lucky or very unlucky.