In the Dublin base we do a mixture of single trips and did some back to back trips over the summer , usually one a month . There will be less W patterns over the winter season as the majority of flights originate in Dublin ( 3 flights a day increasing to 4-5 next spring ) . Therefore ,7 on 6 off may suit commuters but may not suit DUB based pilots so I would imagine most trips will be single trips . If you reduce the turnaround in home base to accomodate W patterns the operator has to provide airport Hotel accomodation and this has a cost so thats a complication . Just my twopence worth , but its a nice operation IMHO .