In my last flight the disconnection over the arctic circle lasted about 5hs. Is the data still relevant then? Does turbulence happen in cycles and is predictable that way?
Five hours is a bit long; you can choose in the app how far ahead you would like to see. We typically recommend looking two hours ahead. This way, for the initial two hours, you'll have some data that may be partially outdated but still better than having no information at all.