... as a general guideline, the gents who post in this forum and who spend considerable amount of their time and resources in Sugar Bowl see a nuanced, but important difference between dating within sugar arrangement and booking a hooker to fuck.
Sugar dates are real DATES, and they are rarely defined by "time multiplied by hourly rate." Quite the opposite. The Sugar Daddy provides an allowance to his Sugar Baby in exchange for a comprehensive date experience which could last several hours, to overnight, to a weekend, to (at least for me) a month-long international vacation.
Now I still book hookers from time to time, between Sugar Dates. And when I do, I fully respect her transparent pricing for her time, and enjoy the (hopefully) off the wall sex we have. Nothing wrong with that at all. But I don't look to a hooker for an emotional connection, nor the companionship, nor the mentoring and satisfaction I get from helping a young, inexperienced lady grow and mature as a young adult that I get when dating an 18-38 year-old Sugar Baby.
So overnights, at least for me, are rarely about offering/negotiating additional compensation for additional "service." To be sure, some SB's might ask for more allowance to offset the earnings they may miss from work, or (I must admit) another Sugar Daddy. When that happens, we can certainly negotiate what makes sense for each of us. But it's more typical for my SB's to like the idea of staying overnight if they can and want to so they can enjoy the additional companionship, affection, attention, and, if this 60-year old guy can manage it, enthusiastic morning sex.
I hope this explains everything. That's why Sugar Babys are not hookers (unless they are - which happens).
Life is good
The Cat