Below is an account found on an enthusiast's site. It may give some idea as to the actual timings. It was posted last night so some of the information will have been superseded by now.
This evening UPS B744F N571UP flight UPS6 en-route from DXB-Cologne crashed on approach to DXB local time at 1941. N571UP departed DXB at 18.52. At just before 19.40 it appeared overhead above the Sheraton Deira hotel at 4,000ft, this took me by surprise as aircraft don't route overhead the hotel when downwind to runway 30, they are further over towards Sharjah. I didn't think much of it at the time apart from why was it routing that way?, it was only as I carried on watching it descend towards the airport my attention turned to my SBS and I carried on watching it on there and noticed it descending very fast. I lost contact at 19.41. Again at that time I didn't think nothing of it as I didn't hear no explosion or anything. The only thing I did notice was 13 aircraft on my SBS all holding for about 10-15 mins. Never before have I seen so many holding over the sea. It was only when I recieved a text from a mate living local asking if I was ok? and asking if I had heard anything about a UPS crashing? I turned on CNN and it was breaking news. Sad news indeed.
Contrary to what the local news and CNN are reporting here is the UPS crashed on take-off. It did NOT! Aircraft are currently departing towards the hotel, if it had crashed on take-ff I might not be here now !!!!! see live data below from my SBS.
A753F0 UPS6 N571UP B744 600 14500 03/09/2010 18:52:02 A753F0
UPS6 N571UP B744 26800 1025 03/09/2010 19:16:55
On checking Basestation reporter and running off an arrivals log N571UP was last recorded at 1941 at 1,025ft . So it departed at 1852 and went down at 1941. I picked it up at 1916 descending through 26,800ft, I don't have what height it reached on leaving Dubai as my box was off for a short period.
Reports coming out of Dubai are still very sketchy and conflicting as to what caused the crash. As I saw it minutes before it went down no fire was visible from the aircraft.