On a tour that lasts over a month, I'm dreaming and scheming very shortly after I'm back and sometimes even when I'm on the road on the that long tour

Yep ... when I was on my 3-month tour of Australia, I was already thinking about a tour up the US west coast. Now that tour didn't turn out quite the way I thought it would ... too much train, too little cycling, but nevertheless the planning stage was while I was on the previous tour.