Question : How long are most people's visits to Frankfurt when they fly in from Greensboro?
Answer : Of course you're not most people, but if you were, you'd stay roughly 10 days.
Question : Is price more important than specific travel days for you?
Answer : The cheapest day to fly in February is Saturday. Flexibility is paramount when booking travel plans in order to keep costs down.
Question : How often are prices changing for this route?
Answer : Flight prices for GSO to FRA change much more than most routes. However, the sooner you book, the better price you tend to get.