I'm migration from version 4.0 to 4.2, the guide says that it usually takes 90 minutes or more depending on the number of records in the databese but it's going on more than 4 hours already.
There is a number increasing (15000 at the moment) and several port numbers shown in the RMM.
Do you think that it's a normal behaviour?
Not sure if you've come accross the same thing as me, but I thought the upgrade wasn't done, but it really was, it's just for some reason the RMM doesn't really show it once it's completed.
It shows sequential numbers I believe those are seconds since the actual uptime.
Try to access the Web UI and if it works, upgrade is probably done.
You could access CLI too and see the upgrade logs to validate.
I stayed on the RMM like you for a while before trying to check if it was done on the Web UI.
I did upgrade from 3.8 to 4.2 directly but from a fresh install of 3.8 without any VM except the default android one so the upgrade went pretty fast according to the logs.
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