The nearest I got to 'regular' rides was two goes at RRtY (12 months at a minimum of one ride of 200km+ each month).
The furthest I've ridden in one go was Calais-Brindisi (2500km) in 11 days.
Three years ago 6 of us rode Ouistram to Perpignan over 6 days (200km a day). That was good fun, with proper lunch stops, decent evening meals, and plenty of beer, wine, etc.