Yes the HV told me that when he was just a little over 3 months but in all honesty I wouldn't want to make it any longer as he gets severely OT....for example this morning he was awake at 5.50 am, was showing tired signs so put him in the cot at about 7.05 and he was asleep within two minutes, no crying, but only slept for 20min. He was then showing tired signs within about half an hour or less of being awake but I thought no way will he sleep so kept him up until about 1hr 15 min had lapsed since he was last awake - tried to feed him too but he was showing mega OT signs and fussing at bottle and breast (mixed feeding) so couldn't get much milk into him, put him in cot and I can hear him grizzling but he's almost asleep already within a couple mins so clearly needs to go to bed. This means his A times so far today have been 1hr15 min both times....which at a 4 month old is way less than what's recommended.
I do try to resettle when he wakes but very very hard to get him back to sleep. I've never managed it yet. I have white noise playing as he is spirited and very sensitive to stimulation. Never tried wake to sleep as his naps vary in length but I could give it a go. Chances are with my LO though that he will simply wake and not sleep as he is so easily woken up!