Most companies specify a 6 month probation period where the contract can be terminated with 1 month notice. That should be enough to plan ahead.
The customary 3 month notice only applies to "permanent" employees, but the company is free to specify a 1 month notice for those employed for less than 5 years if they are not confident.
The customary 3 month notice only applies to "permanent" employees, but the company is free to specify a 1 month notice for those employed for less than 5 years if they are not confident.