APD and IVD perhaps but APD is unpaid and IVD is essentially unpaid because you are just shorting yourself later. If your intent is to drop to adjust your schedule these tools are a waste. Both APD and IVD days can't be used to pick up so you have to be stategic with using a single APD day which makes the other 3 APD days useless. IVD days are paid at vacation day value making them worth less than a trip of equal length and you lose pay and time off during your real vacation.