You were already given a lot of consideration with a 3 month out start date, in my opinion. I haven't seen that very often outside of executive-level positions

You were already given a lot of consideration with a 3 month out start date, in my opinion. I haven't seen that very often outside of executive-level positions myself, but my experience may be limited. Asking for 5 months, with potentially another delay (you asked once, why not again?), would put me firmly (as a hiring manager) into "find another person" mode as you've proven unreliable before you even started. I didn't hire someone to not have them working, and 5 months is a very long time in most tech endeavors.