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I also don't find any specific information which leads me to conclude that you can move any time within that period. However, if you also do plan to marry in that time, be aware that there is a bunch of paperwork that has to be completed before you can officially be married, and if you are planning to stay in Norway, you have to submit the application for a spousal visa a month before the fiancé visa expires.

more info on getting married and visas:

more info on the paperwork you need to get married:

We know the process once I move and have a plan to get married ASAP to account for any delays in submitting/waiting for the spousal visa.

It's just knowing how long I have to move in the first instance once the Fiancé Visa is approved that's unclear. We're hoping it's within 90 days of me receiving it, but if its 30 days that's going to make things hectic.

yeah, there doesn't seem to be any requirement, so as long as you move in enough time to get everything else done in time to apply for the next visa, it seems like you're going to be ok. Note that I have never been on a visa type and don't work for UDI though, so this is just my interpretation of their website!