I have succumbed to the challenge.
With a tail extension so the wing span is exactly 115% of the fuselage length, to the mm.
And a break in the stormy & cold weather.
Bear in mind I hadn't flown for nearly 2 months and not exact timing (no stop watch) but best as I can tell
Full power from 15:35:05.
Off at 15:35:15.
Landed at 15:37:24.
A glide time of 2:09.
I did a couple more runs but the cold got to the head cam LiPo as well as my fingers!
Near 3 minutes looks possible with a full power vertical hand launch. Never done that!