On Mar 30, 12:24*pm, "Robin" wrote:

Would you please share your evidence that 1 week is the "norm"?

It doesn't matter that individuals won't take 3 weeks. What does
matter is that some people will be on holiday (more than, say, in
March or October) for each of the 3 weeks. Thus there will be a
reduction in demand.

Anyone who's a regular rail commuter will have realised that the
trains are *noticeably* less busy in July and August because of this
effect. Yet almost nobody is taking all of July *and* all of August
off.

Neil