Usually 3-4 months for most products.

I find the exfoliations and mask are about 6 months, as you don’t use them as regularly.

Hydrators:

roughly using one pump per day will give you 125 days, whilst two pumps per day will give you 62 days.

Smart Serum:

Each pump delivers 0.2mls of product so will roughly give you 150 pumps per bottle.

If you use 1 pump, twice a day, you’d get around 75 days