@snood,
Oh Snood - glad he is home and recovering
In my experience - my cats (not the boys above) who have had anaesthesia stayed groggy for quite a few hours after - really.... around 24 hours before they have looked as tho they hadn't had a few beers.
It's horrible to watch because they can be so disorientated and try to get up and then flop down. Lots of peace and calm and away from the other kitties - no loud noises... that's what I did ... if you think he's still struggling later on, give the vet another call - they won't mind reassuring you, I'm sure. So glad they managed to remove the tumour.
Hey Debra - the boys are 8ish months now - I got them from the Cats Protection League - they had been there a while because no-one wanted them

- how could they NOT! They really are a bundle of energy and compliment each other in every way. Currently, playing with marbles in the conservatory - it's like kitty subbuteo out there.