You shouldn't need 4 hours to record a scratch track of what - 30 minutes? of songs? It's a scratch track, meaning a track to use as a guide to where you are in the song. If there are a lot of tempo changes in any of the songs, this changes things as you need to record the scratch track at a steady tempo, go back in, pick out the tempo change locations than re-record the scratch guitar.
I don't think there is any reason you can't do this at home, bring your scratch track into the studio as a WAV file - make it stereo with the click on one side and the guitar on the other. then the studio can insert that file into it's project file and you are good to go.
20 hours (total) is probably enough to do all 7 songs, assuming everyone knows their parts and the engineer/mixer is going to comp takes (take the best pieces of each and combine). If you are aiming for straight-through no-mistake takes from each instrument and voice that's a whole 'nother ballgame.
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Mike
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