URGENT quick question - how long to cook chicken casserole

[MumOnaMission]

The packet says 180 for 1 and a half hours. What temperature would I cook it at if I want it to take 4 hours?

or 3 and half hours depending how quick I get an answer.

euwwww, sounds like an o'level maths question to me.

Meant to add, probably about 160.
Why do you need it to cook for so long ?

cos I gotta go out and I want it ready for when I get back.

personally I'd do it lower - about 120 because the liquid might boil off and you won't be around to top it up

nice one thanks for your help ladies. See you later.

iotas probably right. My oven is cr*p at low temps so i tend to hike it up a bit. If you've got a decent oven go with iota.

mines a fan oven and always seems to cook faster than recommended

Got fan assisted oven so did it at 120 and it was perfect. Thanks.