just curious and looking for Biblical insight..
Well, the fact God isn’t the author of confusion, what the ‘year’ to Noah and the Old Testament would have to be very similar to what we normally consider a year today. The concept of the 24 hour day was one that has been around for a long time, back into biblical days.
Generally speaking these early years were probably considered to be 360-day years (as the Jewish folks kept time).
Again, however, part of the differences in time keeping is the reason why nobody will ever be able to pinpoint the exact time of Christ’s return.