It's what I've been told by other breeders, although if you keep your girls cooler it's going to take longer for the eggs to develop to the point of laying. I've always understood that counting the days from ovulation to hatching is more accurate than the lay date to hatching just for that reason.
As far as my personal experience goes, I keep things a bit cooler with my snakes. Ambient of 82, hot spot of 85, and incubator at 88. This year my girls are consistently laying right around 37 days after POS, and being incubated at 87-88 degrees they've consistantly hatched out around 60-62 days in the past years.