So, this is totally new to me. I'm revising 1 book and working on 3 others all at the same time. During my work hours, I write on one of the 3 books still in rough draft form. Then after work and between gym classes I work on revisions for the one that's almost ready to submit.
In the past I've ALWAYS been the type of person to only work on one book at a time. (And I'm like that in my non-writer life too.) I mean, I could write 100 words a day on something new while I was in revisions, but my main focus would always be on the one I was revising.
This summer, I've been accosted by all three heroes of the new stories and they haven't minded sharing the spotlight. I'm pretty sure they know, and are okay with the fact, that eventually, when it comes to the 2nd draft of any one of them, I will have to focus more on one.