I'm doing a treatment for light depression, it passed 7 months and i didnt have one single relapse, for how long must i keep with the treatment?

Ending treatment: I understand you've been treated for light or mild depression, have been doing well for 7 months and want to know how long to continue treatment. You need to discuss with your prescribing doctor if you're on medication when and how to taper/stop meds. If you mean therapy with a psychotherapist is your treatment, you need to talk about wanting to end and decide. Great you've been doing well.