Your accreditation is valid for four years. After this period, the SBB work placement advisor is able to extend it. He can also withdraw the accreditation if this is deemed necessary.
Before the period of four years comes to an end, the work placement advisor will assess the accreditation once again. If he gives out a positive recommendation, you will receive a confirmation email affirming the extension. This extension is also valid for four years. If the advisor gives out a negative recommendation and refuses to extend the accreditation, he will notify you in writing and provide you with his justification.
The work placement advisor can decide to withdraw your accreditation at any moment. He will do so if your company no longer fulfils the conditions for accreditation or because of other serious issues that might by hurtful to the interests of the student. If he decides to do so, he will notify you in writing and provide you with his justification.