I ask because I can’t see having more than 1 full time (monthly allowance) plus a few ppm backups.

...juggled any full time monthly allowance SBs, because I won't go there.  But I have juggled as many as 3 PPM hotties over multiple months.  That juggling act lasted 19 weeks over 18 dates.

Usually one steady SB with two or three PPM on the side plus one-night-stands while traveling.

This!

I generally have from 1 to 4 "active" SB's on PPM at any time.  Plus another 3 to 5 who I see occasionally.  And every 8  
 to 10 weeks I also spend some quality time seeing a KGirl or local pro.  

Only one lady. She is an ex-P411 provider and a total honey. Her SB days were numbered in days. There is no specified allowance, but I just give her money when she needs it, even if it is just to bring her a birthday cake. She is too shy to ask, so I need to pry about the money.  

But I do have what you would have to consider a "full time" SB right now that I have been seeing for several months now that I do pay weekly, but it's an arrangement I doubt would be practical for many guys here. I actually hired her, we see each other four or five days a week and she is not being paid "just" to be an SB. This is one of those times I have to admit is a "do as I say, NOT as I do" type of situation. lol

Like Gambler, I've never done a weekly or monthly allowance.  Only PPM  thjere's a lot of reasons why PPM is the only way to go.  but i consider a PPM SB to be Full Time if she's my one and only or nearly so, even if I'm seeing others.  during the pandemic I actually had only 1 SB and was exclusive with her. (Until she ghosted!) Now Im, working on rebuilding the rotation.  At one point I had as many as 9 SBs I could call on for a date.  But even with that many, there were always one or two I considered my "full time" SBs due to the intensity and intimacy of our arrangements.

Unless they won’t tell you their true ppm ofc and you have no choice if u wanted to proceed. One POt at the time (now an SB) told me she doesnt give out her ppm if she is lukewarm on a SD. Another SB told me her other SD is giving her a monthly while I’m only doing ppm, but i don’t trust her motives for obvious reasons.

If you don't count marriage, never had a full timer.  As far as juggling ppm SB's, it seems like it is either feast or famine.

The advice you’ll here relatively consistently on this board is to always go PPM and the typical range is probably around 3-5 SB’s which there is usually somewhat of a pecking order in that range from 1 that you see on a very regular basis to ones that you only see occasionally. It usually comes down to what your individual budget and the amount of free time you have to dedicate. If you have a budget of $500/month and you have 2-3 days free max, you are going to be on a much different path than say someone who has a $5-10k monthly budget and every night of the week free and open. With all that being said, forget about what’s typical on this board and figure out what works for you. I haven always followed the advice of always doing PPM. I have had set monthly allowances but they generally didn’t start that way. It just became more convenient for me after we established a fairly set routine. I didn’t have any issues once I went to an allowance and the relationship was actually enhanced. Some SB’s like the certainty and less transactional feel of an allowance. I would caution to not enter in to an allowance right off the bat. You just don’t have a good baseline established. At the end of the day, set it up your relationships in a manner that works for you.

You've had SBs ...I can understand the rotation, allot of SD so this. That was the reasoning for my post about SB vs PR. It appears that you as well prefer the SB intimacy over straight provider on the clock and time watcher.  
Natasha 💋

AND, not all providers are clock watchers.  

Have 1 on an allowance.  Bought her a house, luxury cars, vacations, country club membership, etc...Trying to get her off the allowance.  Performance over the years has significantly deteriorated.  
 Maybe you know her.  Profile name is My Wife!

I have never had a monthly arrangement -- my schedule is unpredictable and crowded, so no confidence that i could ever get value out of a monthly payment.

My first SB over a decade ago was like your unicorn. Enjoy the friendship part too.