1. How often do they receive coins?
It depends on the total number of Masternodes. For example if there are 300 ish total masternodes, it will receive about 4.5 times a day. Target Block time is 2 minutes, which means every 2 minutes or so, someone is receiving rewards for their masternode and every masternode holder takes turns. The Hilux blockchain was designed to be steady since DAy 1, hence Hilux had not encountered any hiccups regarding block rewards being unfairly distributed.
2. Can the coins be used without disabling the masternode? Not the 1000 used to make it, but the ones it earns.
Sure. As long as the funds are confirmed, you can use the coins earned. It’s your rewards. Check your windows wallet for the amount of confirmations it has. You can then send them over to your mobile wallet at https://wallet.hiluxcoin.com