Generally, once an application for Schengen visa is submitted to the Consulate, a decision is taken within 15 calendar days. This might be extended to 30 or 60 days in certain cases.
The processing period can be extended to 30 days because of the number of applications received by the embassy/consulate or the uniqueness of your situation.
It can take up to 45 days for exceptional applications to be processed by the embassy/consulate.