I'd lean more towards 'as far as I could persuade my girlfriend to drive out and collect me from'.
But would mostly prioritise just doing the kind of riding with very minimal risk of crashing.
Though will probably just stick to turbo for a couple of weeks at least.
The only times I've crashed on the road have been in Mallorca, Gran Canaria and, in the UK, on my Brompton. If I stick to the UK and stay off bikes with small wheels I reckon I'll be OK.
My buddy a paramedic advised go as far as you are willing to walk back from in cycling shoes if you have a mechanical
Seemed a reasonable benchmark