I'm creeping into this thread as one of those "silly Europe hill walkers".
Please chuck me out if I don't belong here.
I don't climb and never will. But I still love being in what count as mountains in the UK, (Snowdonia, Wales to be more precise), and on my own.
Just day hikes, and in all weathers. Especially winter. People look at me and raise their eyebrows when I say I go alone. But I guess they've never done that.
It means there is a need to plan carefully to make sure I stay within my limited capabilities. The need to know when to turn back without anyone else to ask: either from weather that closes in too much or from a route that is beyond my reach, despite planning. And the need to think of all sorts of other things.
But it's worth it. From 4 hours up to about 8 or 9 hours. Just on my own. At my own pace. Change my route if I want to. Stop and enjoy a lovely view in my own time. Plan what for me are the harder sections on my own, then have the deep satisfaction of achievement when I get up them. And down them later on!
I think it also makes it nicer when I do walk the mountains with someone else: which is not that often, but gonna happen later this week for a couple of days with a lovely friend in the UK Peak District.