2 months for 5.1.1 on all Xperia devices...
The £500 flagship Z4 tablet I have is still stuck on 5.0.2.

2 months for 5.1.1 on all Xperia devices...
5% @ 17:57
30% @ 18:23 (26mins)
50% @ 18:46 (49mins)
Restart the phone.
There is a weird bug if the screen recorder is used, then the mic won't work in calls when making a call. Set to external speaker then back to ear piece and the mic works again. Seems an app or service isn't being reverted back to available once the recorder is done with it or something like that.
Seems to be the only outstanding bug I have experienced anyway. I have since started using AZ Screen Recorder as that does revert the mic back to an available state.