I’ve watched flowering cherries come and go for over thirty years. For most of that time I’ve accepted the brevity of their flowering without ever having taken notes or any other records in order to establish exactly how long the flowering lasts. The best I could do was guess, and from memory I’d have estimated two to three weeks, depending on the weather, and that in certain conditions it might be as little as three days. But I’ve learned not to trust my memory.
Below shows the progress of a single branch of an established ‘Mt Fuji’ cherry over a period of quite benign weather
So that’s about one week at its best, and about two weeks providing a certain level of floral pleasure. Sounds kinda lame, but it’s incredible how much joy you can extract over that time.