Hi,
My DD is about 9 1/2 months old,and she does 4 hrs of A time,although she seems to be increasing her morning A time again.She has done 4 hrs for well over a month now.She did this on her own,I really had to read her tired cues,as if I put her down too early,her naps were short or she wouldn't settle.Her naps are great at moment,but she's waking early,well stirring about 5:30am,then sleeps on and off till around 7am.Think this is a difficult phase at the moment,experimenting with lengths of naps and increase in A time,as the transition to one nap gets closer!Hope this helps.
Clare x