I can’t believe this has stretched to 11 pages.
Firstly, government advice re: exercise is ‘minimise the amount of time’.
Going for 3 hour bike rides isn’t minimising time.
As regards legitimate objections to a long bike ride, well there aren’t any on the face of things however, the reality could be somewhat different if lockdown became extended, the amount of bikes out & about would no doubt increase, that quiet ride you always liked may not remain as quiet.
Another consideration is camaraderie & also the petty nature of human beings.
If you’ve got a bike & are out for 3 hours a day, you are going to p1ss people off who can’t do that. They may not have a bike. They may have family circumstances that don’t allow it. They may object to anybody being out for longer than even 10 minutes a day exercising as they don’t see that as ‘minimising the length of time’, which is after all arbitrary. Whatever their reasoning, you’ll be p1ssing them off.
...and that ain’t good for the old Blitz Spirit. The sense of ‘we’re in this together’, suffering collectively for the greater good of saving lives.
However much some people and their bikes might not give a toss about those kinds of things doesn’t mean those feelings don’t exist.
Which is why cyclists all things considered should be sensible, and keep rides to an appropriate & considerate length.