When will my B2 certificates expire

A B2 certificate cannot expire.

In cases since the Certificat is a bit older and you still live outside Germany, however, it may be asked by the authorities (For example, German Embassy at VISA application) how much you have lost of the German language in the everyday life of Tagallo and English. Then there may be a request to do a refresher with proof, but the certificate itself is valid for life.

If you are not sure, you can always ask the German embassy. In the meantime, the officials assume that if the certificate is older than 12 months and no refresher courses have taken place, that you have lost some of the language. If the date is a little older, a refresher course would be the right solution and taking a B1 Examen. The Embassy will then just see a B1 Examen.
Talent Solution offers refresher courses for these cases