I bring mine in to protect the fields not them - they are waterproof, hairy and at the moment too fat. One with arthrius is an exception but even he is better out and moving than stuck in.
Mine can stay out 24 /7, then be in for a day, then out again for two weeks, then in over night for 3-4 days - I deliberately try and make sure they don't have routine (it helps them not learn to hang around the gateway). They seem fine with it and I've managed them like this for many years.
Some winters they have been in c.20 nights the whole year, others they have been in for what feels like months - sometimes 24 /7 in with turnout in the school when the rain has been unrelenting.
I am lucky I can spy on them from the house - in some of the grimmest weather they are happily grazing in the middle of the field - in weather that looks OK to me they are huddled behind the stone walls (at which point I'll go and get them).
If I go to get them in and they look up from eating - stare at me then carry on eating and ignore me - they usually stay out.
If I go to get them and they run to the gate I know they want in.
Mine came in and stayed in overnight... they practically bowled each other over to be the first to come in and once in settled in for the night with no signs of wanting to leave...
I'm going to end up leaving in tonight too. It's just miserable and sodden and it's a bit early for trashed fields.
Sunday night is looking drier so should be ok to resume full time turnout.