What most of us have found is that the longer you use the Feather system the longer the blades last between changes.
Like the DE, a lot depends on the user/blade/YMMV thing, just takes some time.
Since I have been running 16-20 shaves per blade (that took months to get to) when I change the blade I disassemble the razor and clean the inside with an old toothbrush. There is always some crud in there and eventually it could gum up the spring action. The less you handle that blade the better off everyone is going to be. I only take it out to pitch it (carefully, like you would a DE)
When the Feather was my regular at home shave I had this apothecary jar (like one of those clear glass square things with candy or cotton balls, bought it at a Goodwill store for $1) It had a gasket lid and i filled it with 91% rubbing alcohol. I would rinse the razor with hot running water then dunk it (carefully...) in to the alcohol for a few seconds, remove it and tap the spine on the counter. I store the DX folding in a plastic two piece tooth brush case. Get the smallest jar you can work with as you need to change the alcohol once a week.
If you have the SS non-folding you will need some way to protect the blade (and you) between uses.
There is a plastic snap on
guard that works well, make sure you get the SS model for the SS, the RG/DX will eventually break...These will save blades, stitches and anything that comes in to random contact with one of those un-protected blades...
Feather razors are allergic to bleach by the way, its like Kryptonite to them...
Smooth Shaving...