Don't 'transition between rounds' so often these days that I only have 1-hour punts. I tend to discuss with the girl and point out that, because of my age, we'll almost certainly have to proceed at a slower pace than she'd usually be expecting to.
When I saw my last - now-retired - Regular, we had a 4-hour session. That was effectively 2 x 90-minute sessions with a break halfway through for a cuppa coffee.