The twins being on their own separate place/timeline, and since ours is flexible and bendy (I blame the lack of technology and calendars...?) I'd go with however far ahead you want to skip them- I think they need a few months to realize something's off with Gwyn and get used to roughing it and with the way a mummer's troupe would travel it would take them a couple months to get very far North.
Maybe two months in we could have them considering leaving the troupe and Genna finally explaining some stuff to gwyn?