First of all, thank you very much for once again for giving us the inside information! ^^
For the plan itself, it is rather a shame to take that long. I don't think it took United that long to get the new seats in and their fleet is certainly larger.
So this winter, they only spend 9 weeks (if one by one) to refit aircraft with new seats? Kind of inefficient, isn't it? I assume the total downtime for C/D checks for the airbus fleet during the winter period is definitely longer.
Lufthansa, once again, very disappointing.
Hopefully, they will rethink and reschedule.