You didn't say that in your OP - how was anyone to know you actually wanted help and advice? I took your OP to mean that you'd heard some comment you thought sounded a bit ridiculous and you wanted to know if there was anything to it. had i known that you wanted to hear from women who had BTDT, then I would have responded to the thread differently, so I apologise for that.

From my perspective (and purely anecdotal) I have had 4 births. For 3 of them I would have been in a higher range BMI. It didn't affect my ability to dilate or labour at all. My labours were all under 12 hours. Although the 3rd one was induced with syncto and it was also incidentally the fastest of my 3 births at 4.5hrs. the 2nd and 4th were 8hrs and 6hrs long. never was it suggested to me that my size would/could have an impact on the way I would progress with my labour. I think that if you really wanted to make a point of it when you have your next baby then emphasise how your first two births were - you have that history of previous labour that is going to count for far more than your size will. Analyse your births - were they active, were you supported by people who encouraged you to stay active or try new positions that may help you, did you labour on your back, was there any emotional issues that could have made things slower, did you have an epidural etc. All of these things can impact on the way your body works during labour and it would be a good idea to look closely at your first two births and see if there is anything there that could have been the trigger.

Good luck