MRWADDLES

so im trying to set up a server right now and i cant figure out how to make it to where if someone has a rank they get there ranks crate key every 24 hours EX: Bob pays for RANK: god. Then bob gets the crate key god every 24 hours if anyone knows how to do this please let me know bc i have no clue how it even works.???? im also using luckperms....