Don't have the album so can't help with the track lengths, but do you have any software that will allow you to 'see' the sound?

I assume you have recorded each side of the album as a long track (in .wav format).

If you open the track in your recording software, you should (hopefully) be able to display the sound file like a sort of wave format, so you can see the 'chunks' of sound.

If the album is a studio recording, you usually get gaps which are easy to see, but it's more difficult for live recordings. Even so, if you look carefully, you can often see where the songs/tunes start and finish, more or less.

It would help to know what recording or sound manipulation software you have.