If you have a large amount of filesystems, it can take a long time too.
That would make sense I guess since I'm using about 26 disks now. Thanks for letting me know!
Depends. If your Linux skills are solid, I think it is a good upgrade but I would install fresh over upgrading. There is no OMV provided upgrade path. So, you will have to manually upgrade OMV stuff.
Is there an improvements or additions changelog in 5? Everything is working quite nicely for me right now, but I'm always interested in newer/better things. If there's not too much different, I'll probably stay as is for a while :D. Thank you for the information.