Help! Leg of lamb is HUGE! Cooking times

[LambNightmare]

So I ordered a leg of lamb for Christmas - plan is to slow roast it so it falls off the bone. However, I ordered a maximum 2.5 (ish) kg and it has arrived 3.8kg!!! FFS!! There are only 5 of us! We are going to be eating Shepherd pie all December!

Anyway, how many hours does it need to slow cook? I'd normally do it about 130/140 max. Do I need to get up at the crack of dawn for this? We want to eat at about 2-3pm.

Help! Thank you!!

I'd drop the slow roasting plan with a leg that big and cook for 13 mins per lb plus 20 mins for medium rare and plenty of resting time. You can portion leftovers up and freeze for future use.

I'm cooking a 2.8 lamb shoulder tomorrow and I'm going to do it at 150 for 4 hours under tin foil, then have a look and decide if it needs another 40-60 mins.

Really need to slow cook as I'm pregnant and don't want to eat rare meat and only like normal roasted lamb properly rare- iyswim.

I'm thinking try 6 hours?

Or maybe 7 hours actually. Easy enough to keep slow roasted warm if I've overestimated the time needed?

Bone it and cut it in half?

I've made this a couple of times and it's delicious - www.bbcgoodfood.com/recipes/slow-cooked-leg-lamb. Seven hours in the oven though... You could sear it off the night before and prep the veg then just stick it in. It's for a 3kg leg and imagine it would work fine for a bigger one.

I'd slow cook it as I think it might be an "old" lamb!

Cook it the day before unless you are normally up at six - it'll need an hour out of the fridge to get to room temperature, then cooking and resting for about an hour.

I’d also do 7/8 hours. Nice and slow, easy. And then tasty