I loaded up the style and the demo song and changed the choruses to 40.
Since there are multiple choices in the demo song, I made sure the demo style had the guitar 2 solo track and clicked generate.
The non-solo portion generated in about 13 seconds and the solo portion took 2:14 to generate for a total of 2:27 to complete.
I then closed BIAB, cleared my temp files and this time loaded the demo song WITHOUT the solo track and it took 17 seconds to generate and play the entire song.
I would say that if you have 40 choruses of soloing to generate, that will indeed add quite a bit of processing time to complete.
2022 version with latest patch on an SSD drive.