They probably have some sort of fast / monthly vesting schedule instead of some (what I think is truly bizarre but common) yearly vesting cycle. If a person wa

They probably have some sort of fast / monthly vesting schedule instead of some (what I think is truly bizarre but common) yearly vesting cycle. If a person wants to leave 18 months into it let them go with 18/(412) percent instead of having them wait around another 6 months to get 50% instead of 25%. For the 1 day employee that could work out to 1/(4365) * 1.5%. But there should be a cliff as having them jump that early can be disruptive.