Someone please correct me if I am wrong, but I believe that AAMC is slightly delaying the release to medical schools this year to account for the change in MCAT. Thus, your secondaries might not arrive from school X as early they had in years previous. I would definitely keep an eye on the school specific threads as people will be posting when their secondaries arrive, and then 30 minutes later they will be posting when they submit those secondaries back to the school (and then they will be complaining that the school's website is running slowly because 2000 other people are trying to do the same thing at the same time).
I have also heard the conventional 2 week wisdom. Most of my secondaries got submitted within the two week window, none within 30 min b/c I didn't prewrite (bad emraldragon, bad dragon!). Even though it seems some schools are not as strict about that time window, getting them back in swiftly seems to me to be a great way to show that you are interested in the school. If your secondaries are showing up over a month after you received them, my first conclusion wouldn't be "Gee, so and so must be really busy with work and/or school and are making time to write while they can," it would be, "Gee, so and so took four weeks to write two 200 word essays, maybe they wrote all their other secondaries first because they just really don't want to go here, or maybe they really don't want to go to med school at all because they just can't make time in their life."
Harsh, I know. Not all adcoms will think that way. Most may not. But part of winning this game is hard work on your part, the other part is luck in the right adcom finding your app and falling in love with it. Don't give the adcom looking for faults any reason to find one.