Maintain above 240, once every 17 minutes a cycle each day, basically just working in vain! There may also be losses in between!

Airdrop worth $MAT 243 points requires at least 17 points to be brushed, which means a wear of 3.2u per day, totaling 48u wear over 15 days, and accounting for gas, it's about 52u. Each cycle can give you at most two times, and if it gets squeezed a bit, it could mean dozens of u. You might as well just deposit 50u directly into the account each time, with each person receiving a little salary every cycle.