How many times can u visit a hifi store before it annoys the store if u plan on a purchase

I plan on buying a McIntosh system C12000 and 2 MC611 monoblocks in a about 3 months from this Stereo shop I have chosen. I’ve been to the store about 4 times over the past year and half to listen to various components trying diff equipment.

My question, is, what would be considered visiting the store to much before I buy a system? I plan on spending over 20k but I didn’t know what is proper etiquette.