According to Mercedes, for oil level checking purposes, hot is 5 minutes, cold is anywhere up to 30 minutes:
Originally Posted By: Mercedes
Notes on checking engine oil level
With the engine at operating temperature, the vehicle must have been stationary for at least 5 minutes with the engine turned off
With the engine not at operating temperature, the vehicle must have been stationary for at least 30 minutes with the engine turned off
Originally Posted By: Mercedes
Notes on checking engine oil level
With the engine at operating temperature, the vehicle must have been stationary for at least 5 minutes with the engine turned off
With the engine not at operating temperature, the vehicle must have been stationary for at least 30 minutes with the engine turned off