I’ve seen a number of ‘dust dips’ over the years, and 6 weeks in low state seems to be a fair average time before a rise sets in again in the very obvious ones. There are exceptions – for example, V2362 Cyg (Nova 2006) faded 4 mags from 8-12 before a 16 week plateau set in, then rebrightened to mag 10 before a very rapid decline followed by a gradual fade to quiescence. This was a dusty Nova, but the hot dust was probably confined to the inner region of the system. Going on the quite unusual behaviour so far seen in V1391 Cas, it will be interesting to see what happens next over the coming months.
Gary