Key legal question
Whether unpaid leave during the probation period extends the probation period under Art. 335b CO.
Extracted holding
No. Unpaid leave suspends performance and salary, but not the contractual relationship or the running of the probation period.
Extracted reasoning
The statutory grounds for extending probation are exhaustive and do not include unpaid leave. The probation period is calculated by elapsed time, not by actual work performed, and brief interruptions do not break the employment relationship.