I can't remember when DD dropped her catnap but it was definitely by 9 months - more than likely 8 - but when she had it she often had it in her pram while I did my afternoon walk around the park - that way she could take it or leave it. Sometimes it was so late that we walked, came home, fed her, bathed her and put her to bed
This is the routine I wrote out for my hubby when he looked after her one day
6.30 up and 180mls
7.30-8 breakfast
9am sleep (not less than 2.5 hrs after she wakes up)
11-11.30 food
12-12.30 bottle 120 mls
1.00-1.30 down for nap (again >2.5 hrs)
3-3.30 awake
3.30 120 mls
5.30-6 dinner
6.30 bath, bottle, bed (she often only took 10-30 mls at bed)