How Long For Bloodwork?

If I’m taking letrozole and will be tapering off of it with toremifene, how long should I wait before getting bloodwork to see what my hormone levels are like without the influence of these drugs?

I’ve decided I’m going to see my doctor about the lumps I can feel in my chest that cropped up after using Anavar alone and I’m also going to ask for some blood work to be done.