just adding my 2 cents, which I've posted in other places before.
I would strongly recommend applying to 1-2 "safe" (or safer) schools in R1, just so you can be relaxed after R1 decisions come out and not have to panic with zero admits by R2 deadlines.
With that said, You can try what I did, which is work on the R1 application with the LATEST deadline FIRST. This way, you polish your essays enough for submittal (at least you think so at that point
), then apply the knowledge you learned from that first app onto the 2nd app (which could be a safety school or one that has the 2nd latest deadline). Finally, save your dream school apps for the 3rd or 4th app to do. If you do it too late (i.e. 5th app or later), you run the risk of completely burning out and not delivering a good product.
Then, after the dream schools are out the door, you come back and re-polish the 1st and 2nd apps before you submit. You'd be amazed at how "crappy" the application you thought was done looks now.
Just for reference, last year, R1 deadlines for Stanford, Haas, and UCLA were 10/22, 11/5, 10/24. UCLA, while not a "safety" was probably my safest bet. Haas was the latest. So I did Haas first, then did UCLA, then Stanford. Went back and polished UCLA very quickly before submitting the first two. Had another 2 weeks to work on Haas before I submitted it too.
Hope this is useful for some people...