Minimum 2hrs to make it worthwhile for the transportation to and fro venue, meetup before shoot, and meetup after shoot to hand over disc etc. I think even for not very experienced freelancers doing snapshots it would need to be $188 minimum to be worthwhile.
I am just a regular guy, 2hrs without prints is $388. Can get approx 10 ROMs each year.
This is just "snacks", you have to put into consideration that someone booked you for ROM and you cannot take ADs already. Also if the ROM is right smack in the middle of the day, you cannot do much family time "before". "After" is ok, I usually just go and meet my family directly after the shoot. As I do not drive, I have to carry 9.7kg of equipment along with me while shopping, dining. Before the ROM you have to pack your equipment, test, prepare to go out like bathing/eating your meals, changing clothes, psyching yourself out.....and coming back bathe again. Worth it for $188 if you are inexperienced? Shd be still ok & bearable. But shd you do it for $88? I hope not! (Well there are always people doing $200 shoots for 6-hrs, and usually also rubber band timing one...bleah....and I heard now the market is dipping to $120-150 already as cam operators
).
For hot dates you might not even want to do ROMs. Any 1-yr exp freelancers wanna do 2-hr ROM for $268 on 20th Nov, 11th Nov? I don't think so.
What competition is there for ROM? Its either do, or don't do, worth or not worth your while. ADs is different, 1 shot all the way.....
And remember, ROMs you still need to perform, and no such thing as late, camera spoilt, PC corrupted, CF/SD corrupted. You still bear the reputation being tainted risk, due to weather, theft, unreasonable couples etc.