Ooooh yes, my dd had a max of 3x 30min naps a day, but now, at 11months, is napping consistently for about 1.5hrs in the morning, then another hour after lunch. I thought we'd never get there, but it was nothing I did, just started napping longer. She naps in her pram in the hall, so can do it anywhere too!
My almost 6 month DD started taking longer naps when she was about 5 months after a period of me more consistently putting her in her cot. Now she has mammoth morning naps (3 hours yesterday) and a few afternoon naps and goes down no problem at 7. If only she would stop waking for quickie feeds at night life would be perfect
Mine was a 30 minute napper until 10 months when he got chickenpox. Don't know why but that cured it and since then he had two decent naps a day which dropped to one lunchtime one just after a year. Can't really recommend that as a course of action though!