These are really great highlighters. I love them. And they last a good time. The last time I purchased these highlighters were in 2020. So they lasted around 2-3 years for me.
These are beautiful colors but they do take quite a while to dry compared to over highlighters. You really need to blow on the mark if you plan on turning the page soon after. My pink one looks like it's growing mold as well after having for a few months having only been used a handful of times.