[swimslowly]

Well, normally albums have "tracks" and those are mastered individually (but in the same session) to account for differences in levels, eq and dynamics between the tracks - so that the album as a whole is cohesive. I can't imagine a mastering engineer mastering "each song indivdually" on different days with the expectation that they were going to put together a cohesive album.

In any case, this is how it normally happens:

1. finish mixing your album (all the tracks).
2. sequence your tracks into an album.
3. write down what you want for track spacing/fades/and anything else relevant (hidden tracks, monkey noises at 04:55, etc)
4. compile all of your music onto a master tape, dvd, or a data cd and print out what you came up with for #3.
5. attend the session and/or mail it off with contact information in case the engineer has questions.....
6. approval/revisions
7. send master cd for duplication
8. have a party
9. have another party
10. start stuffing envelopes
11. continue stuffing envelopes
12. send emails
13. more emails
14. play some shows
15. start recording again
16. back to #1

If a mastering engineer wants to get one track at a time and master them into an album over the course of a week, and then compile them into an album - that seems a little odd. But maybe I'm not clear on your question.

Ryland