How long does a tub of s5 cream last you

[abovedagame]

Question is in the title. Let me know how fast you guys are going thru this stuff. I only apply s5 to my hairline and I'm a nw3. If I had to guess one tub will last me roughly 9 months as I only use a thin film per the instructions.

 

[Norwood One]

Lasts me 5 months. I should be applying more to the back areas as well...but I don't sometimes.