12 miles on my fixed road bike. Took five miles before I could feel my fingers, then fine. Struggled to keep the average speed over 14 mph, but there was a headwind (and snow).
That clothing in full:
Sidi winter road boots
Sealskinz thin socks
Pearl Izumi Elite thermal and windproof biblongs
Icebreaker merino 200 baselayer
Pearl Izumi long sleeved fleece jersey
Club windshell – comments on the other thread please 😉
Polaris Cranium skullcap
Btwin neoprene winter gloves
And yes, 23 mm tyres are fine for snow, just make sure you ride fixed to feel the traction.