I apologise if this is a dumb question, but I can’t seem to get the numbers to fit:
On the webpage it says it will last one month, but there are 30 servings/scoops. Shouldn’t there be 60 servings/scoops if I am to take it twice each day? 
You are correct. A tub has 30 servings so you need two a month.
Originally I remember seeing it advertised for those who train 3x per week and dosing before/after each session, which is about a month
Right on! Thanks for the quick reply Leah