Even when I still played 3.5 (I haven't touched D&D since as player/DM, am touching 5e now as a publisher) I only ran homebrew modules. So my answer is never - I have never ran a WotC adventure module in my entire life. I did run some TSR modules back in 1e/2e days, but I started homebrewing back then, and subsequently never purchased another paid for module. I have written, play-tested and published modules myself, but haven't touched a published module that I didn't homebrew in the first place in nearly 30 years.