I repeat, rolling one set of six abilities takes longer than Point Buy if you’re not trying to waste your day on it.
If you use point buy with any frequency, you know that after racial adjustments, every character ends up with either a 16, 14, 14, 12, 12, 8 spread or a 16, 14, 14, 12, 10, 10 spread, depending on how the player feels about having a -1 in something (usually Strength or Intelligence).. Maybe a 17, 14, 14, 10, 10, 8 or a 16, 15, 14, 12, 10, 10, 8 if they know they want to take a Feat that gives +1 to something when they get the chance. If it consistently takes your players more time to get to that using point buy than it does to roll 4d6, drop the lowest, and add up the rest six times, then they’re either unfamiliar with point buy, or just genuinely enjoy taking their time with these decisions.