5 days for 120gig is BS. 25 to 36 would be a good average although I have seen some go longer. You can also do an Xbox to Xbox transfer if you have 2 modded available. Use Avalaunch or Unleashx for dash and connect through file manager, it's very fast. Ther is nothign wrong with the OS upgrade wizard, it was just never intended for large transfer, just setup from stock to mod.