While the THC content in the blood plays a decisive role in legal terms, it should be emphasised that the pure blood value does not always correlate reliably with actual fitness to drive. In fact, many users are completely lucid and fit to drive again after just a few hours after consuming THC, even though the THC level in their blood is still above the legal limit.

The psychoactive effect of THC is often only noticeable in the first few hours after consumption. After that, most users feel normal again and are fully able to carry out their usual activities - including driving. However, despite the decrease in effect, THC residues may be detectable in the blood or urine for longer. In practice, this means that you may feel able to drive again for a long time while the THC blood level is still above the permitted limit. There are enough bizarre cases in Switzerland to illustrate this: No longer smoking pot - but still tested positive | Observer

It is therefore important to understand that although the legal limit is intended to minimise the risk, it does not always reflect the individual reality of consumers. Nevertheless, if you want to be on the safe side, it is necessary for legal reasons to observe this limit in order to avoid fines or the loss of your driving licence.

(Important: However, it should also be pointed out here that the police cannot or may not carry out arbitrary checks for THC in the blood. Without concrete suspicion, the police have no reason to check you for THC in your blood on the following day of potential consumption and, provided you feel fully fit to drive (and are not carrying cannabis or other suspicious paraphernalia), you are unlikely to be stopped.)

(These waiting times are a conservative estimate based on average metabolic rates and consumption of THC. However, individual differences (metabolism, body fat percentage, frequency of use) may increase the time to cut down).