Actually, when playing in open world if you don't check the lab in the first week, the line in the menu (when you are in your office) disappears forever and you're effectively locked out from visiting the lab again (and you don't collect money from the blue pills).
I just reloaded an old save and fast forward the days (just visit the office in the day and then back home and skip time) to test this, and after exactly one week from the first batch it was never possible to visit the lab (and deliver pills).
I don't know if this is the intended behavior in dev's mind or it's a bug, but at least now you know what you can do to avoid it