It's your prerogative to move on. It's my prerogative not to end a 3-month search by hiring someone whom it'll take 4 months to get up to speed on our codebase

It's your prerogative to move on. It's my prerogative not to end a 3-month search by hiring someone whom it'll take 4 months to get up to speed on our codebase when they'll be gone in 9 months and I'll have to do this all over again.