I'm more of an "every couple months" diffuser cleaner, but your Diffusers will last longer if you take better care of them!
Standard diffuser recipes run roughly
500 ml 15-20 drops total
300 ml 10-15 drops total
100 ml 3-6 drops
These will vary depending on the potency of your oils. For example, Lemongrass and Cassia are very strong-smelling oils so you can use less. Start with the smaller number of drops and add more if you prefer.
Click the image to read this helpful doTERRA article.