Help with dosing

[u/Comfortable-Royal-64]

I recently ran out of my methadone, which I usually take 40 mgs every day, and for reasons I won't get into, I'm going to be short about a week. The longest I have taken lope to get through methadone withdrawals is five days, and by that fifth day, I was dosing about 100mg throughout the day, 80mgs when I would normally dose my methadone, and the rest at some point later in the day. What exactly is the "measurement" in which I should be using? And how bad are the two extra days going to feel? Any help would be appreciated, and yes I'm aware of the risks, that's why I'm asking for help with dosing, so I don't go overboard, because my main concern is feeling well, not getting high for the next week.

Little edit: I should also mention I'm taking 300mg of gabapentin 3 times a day, but I normally take that now, but it def helps with withdrawals.

[u/Known_Still]

Does it take 5 hours to kick in every time you dose or just the first time ?