Once
today is over, there are another 18 playable days left, each one with 9 events. That's 162 events.
Let's say it takes 15/20 events to close secondary paths (it's hard to define
secondary path by now, I know), and let's say Sophia has 15/20 sex events (some of them with the same characters) + other 20 transitional events in the final part (during the last days she's not going to be fucking 24/7 like a rabbit, she deserves some rest
). This leaves us with close to 100 events to develop the relationship with the really important characters.
For each main path (GW + lesbian + filthy) there are probably some overlapping events that help her to be more open to have much more fun with Liam (GW), with other women (lesbian) and with other men/boys (filthy). This means part of the job required to have sex with one character is done while following the path of another one that's
compatible, such as opening her mind to have sex with boys for Sam while she's in a Dylan event, or something similar with the lesbian path (opening her lesbian side with Patricia will help her lesbian relationship with Ellie in the future, for example).
Having said that, there are still a lot of events to play and I expect L&P to add some secondary small paths (maybe with a couple of events) as long as they have something to offer.
Regards