How many (minor) spider veins can 3ml of sclerotherapy treat?

I just purchased a 3ml treatment of sclerotherapy injections at a local clinic. I’m a healthy 22 year old with mild spider veins all over my thighs and one slightly larger cluster on the back of my thigh. Will this be enough to treat all or most of them? I’m starting to wonder if I should have bought two but they acted like that was only for severe cases which I don’t think I have…yet.