Hi KDG, your bankguarantee may infer a date but that's about it. I believe that if you check your contract then it will probably say that completion will be within 18 months of the granting of the building license.
If your license has been granted then calidona should have contacted you to inform you of this and give you a rough idea of when completion is likely to be.
According to law, bank guarantees are legally binding until you have completed but i would however take the necessary step to re-new them if they are due to expire soon. Do this by contacting both your solicitor and Calidona at least a couple of months in advance - hope this help - Russ