Well it certainly isn't what most manufacturers reccommend, they want you to use more so you buy more :roll:
I give Arnie about 2 small handfulls but have found the best way is to monitor their poops, if they are producing too many soft poos then you are probably feeding too much, on the other hand that may just be because the food you are feeding had a low fibre count.
I only feed enough to keep them going until 12pm, I feed at 8am so that's 4 hours to gobble down breakfast (I am lucky that they dont gobble down loads of pellets at once). This also ensures they eat their greens in the evening :lol: