For sentences of up to two years, Section 6(1) item 2 StVG allows postponement on application if later enforcement appears more useful for future prospects, a business, maintenance obligations or compensation than immediate enforcement, and the other requirements of section 6 remain relevant.
Postponement to promote future prospects may exceed one year where necessary to complete vocational training, and concrete supporting evidence must establish the stage of training, expected completion, and consequences of immediate imprisonment.
That does not mean automatic approval. An application must show why later enforcement better serves resocialisation, which training is ongoing, when it will be completed and which documents prove it. General statements about work or training will not be enough.