even a small tube can use very long ald.
Let's say u reapply a new thermal compound every 4-5 months, so u jus use 3 times each year, so a small tube should able enuff for at least 2 years la(for me )....

but if u use it to apply on the GC then different story la~

P/S: I still dunno how to apply AS5 on the GC, can someone teach me, izit the same like apply it on proc?

around 4-5 months then can reapply with a new layer of thermal compound. But some people will reapply once every 6 months...