# Time Limit

The explanations computed by the explainer can be hard to get, for computational reasons. As a consequence, the `time_limit`

parameter must be considered in some methods for computing explanations. If this `time_limit`

is reached, then the method stops and can return an approximation of the desired reason or `[]`

if no approximation was found. By default, the time_limit parameter is set to `None`

, it gives an infinite amount of time for the calculation of an explanation.

Moreover, all explainers have a variable `elapsed_time`

set to the time in seconds needed by the last call of the method used for computing an explanation. It is equal to `Explainer.TIMEOUT`

if `time_limit`

was reached.

The following piece of code provides an example of usage.

```
minimal_constrastive = explaine.minimal_contrastive_reason(time_limit=10)
if explainer.elapsed_time == Explainer.TIMEOUT:
print("time out")
print(f"minimal contrastive: {minimal_constrastive} is an approximation.")
else:
print("time to compute the minimal", explainer.elapsed_time)
print("minimal contrastive:", minimal_constrastive")
```