i change mine every 3-4 shaves. is that a decent amount of times before switching or could i use it more
What kind of blades are you using? Your mileage will vary greatly by blade brand, though 3 or 4 is a pretty respectable average.
I tend to get about five out of my Derby Extras, seven if I clean them off with mineral oil after each shave.
This is one of those YMMV questions..Some can get 6-7 shaves whilst others get only 3-4 shaves... I generally use my blades 3 times and toss them.