While it is obvious Jr could have taken Michelle to Palm Bay the following morning, I wanted to see if it was possible that Palm Bay was viable to occur all on 11/17 as well. Turns out it might be.
The total time between 3:18 and 8:08 (the time the phone powers down as shown on texaslil's map
http://g.co/maps/hk53g) is 4 hours 50 mins. The only thing you wouldnt get done until AFTER 8:08, is dropping off the hummer and returning to the condo, which you would be in the middle of doing when you pass the 8:08 area.
The amount of DRIVE time it would take to go from the condo, to Sr's to Palm Bay, back to the condo and to where the phone pinged in the area of E Oak Ridge Rd at S Orange Ave, is 3 hours 34 mins.
The difference is 1 hour 6 mins to accomplish all the necessary activities along the way, including changing the appearance of the hummer, dropping off the kids and subduing, killing and leaving michelle somewhere and being back in the 8:08 ping area.
You would have roughly another 2 hours and 22 minutes from the time the phone powered off at E Oak Ridge Rd at S Orange Ave to drop off the hummer you had already picked up, and be back to the condo, take back off in your truck, and return back to the condo like you had been gone in your truck the entire time, by the time you would be meeting up with LE, regardless of who got where first and using 10:30 as a possible meeting time at the condo.
From roughly where the phone pinged to where the hummer is found, drive time is 16 mins, and would make the time about 8:24. A bus would have been arriving to this area around 8:52
http://www.google.com/maps?saddr=Walden+Cir,+Orlando,+FL+32811,+USA+near+32801&daddr=Rose+Blvd,+Orlando,+FL,+USA&date=11%2F17%2F11&time=8:52pm&sort=walk&dirflg=r&t=w&z=14&vpsrc=0&start=0&geocode=Feu9sgEdk0kl-ynv3iZ3sX7niDE-MfXjdhYuDA%3BFduJsgEdntcl-ykZadtME3zniDGeGsk3KgTDjA.
If he rode a bus to his parents, it would take roughly 28 minutes and then he would have 2 blocks to walk. His parents could have him back to his condo in another 22 mins.
So, if he got a ride straight to the condo from Walden Ct from a friend or his folks, it would take about 25 mins, getting him back to the condo by around 8:49, but using the above possibility with using the bus, he would get back to the condo closer to 10pm, including adding 9 minutes for walking and 5 minutes for rousing someone to take him home.
That leaves a half hour, even if he took a bus part way, to meet up with LE around 10:30. I don't know if he was home already or not when LE got there, but either way, there was time. Either way, the approximate half hour minimum that was left could have been used to make sure he and his truck and his condo were relatively clean.
Total drive time used would have been about 4 hours and 20 mins to 5 hours 30 mins out of a possible total time of 7 hours and 12 mins, which it the difference between 3:18 and 10:30.
Now if I haven't totally confused you, here is the potential map:
http://g.co/maps/ef9n4
This is total conjecture and MOO. And yes, I realize they don't think she is at Lowe's, but it is probably in a somewhat relative area, time wise +/-