20 mins per lb plus 20. Plus rest time, unless you’re hungry 😀
Though generally for 1.5kg, roughly 1.5hrs is plenty at 180C fan oven.
Or when juices run clear.
Some say to start at 200C and then drop later. Can’t be bothered with that. My oven also has a rotisserie kind of option, except the rotating involves manually turning the chicken. However it does state it can be set to 150C in this mode and don’t need to wait for the oven to heat up first.
Anyway, 2hrs+ sounds like way too much.
Is it also in a bag to protect numpties who can’t cook safely and add to further packaging waste?
Should add, I don’t know about organic. Probably requires some special treatment and a visit from Prince Charles to approve it.