My toner is six fluid ounces (150 ml.) and lasts me at least 4 months.
At the time when this photo was taken, the toner is 5 months old and is still a quarter full. Note that I use this morning and night and I don’t use any other toner.
I didn’t really notice at first that my toner lasted that long, but when I did, I realized that it’s probably because it comes in a spray bottle. You might want to consider moving your toner into a sanitized spray bottle.
Anyway, since my toner already comes in a spray bottle, here are other things I do to make it last longer:
1 – I use a cotton pad instead of a cotton ball. Cotton balls seem to soak up too much product that I end up putting more of the toner on the cotton ball instead of my face.
2 – I have a tendency to keep spraying toner on the cotton pad until I feel that it’s a little bit soaked. A solution I thought is to split the cotton pad apart. The split up half will be thinner and would only take 2 to 3 sprays to get soaked up.
3 – Do away with cotton pads altogether. Some toners nowadays have a slightly more viscous consistency that you can apply then directly on the skin.