Antibody test

[LifesTooShortYOLO]

I've been invited for an antibody test via the Zoe app.
Can anyone tell me how long ago the test picks up potential antibodies if you've been previously infected with Covid please?

Is there a cut off point?
Thanks

The email after the last one I did told me it was unlikely (in my case) that is ben infected with covid in the last 6 months. I don't know what basis they chose that time frame on though.

A friend had confirmed covid last April and still had antibodies in May this year.