DD is 22m, has been at a Nursery since 12m I do 3 full days because:
Only 3 lots of petrol to and from work.
DD gets to nap well and do the whole days activities.
I work Mon, Wed, Fri as it means only one day in a row away from me and the people I work with are on a 7day rota so by doing those days I see each shift at least once.
The work I do demands concentration, if I was checking the clock to make sure I did not miss the cut off to the afternoon session I would not do anything. As it is I always finish on time as everyone else clocks off then. I annoy a few Managers occassionally by ducking out of a boring meeting but I know the staff (who I am there for) are finished anyway.
When DD starts school I will go to more days with less hours but I think it works well for now.
P.S the naps/meals is amazing - DD just adapted, I went to pick her up from her first settling in morning and she was asleep in a cot. Until then she had only EVER BF to sleep The girls at Nursery are magic