Dear Spot devs,

I want to measure how much time it takes Spot to decide whether the language of the automaton A is contained in that of B.

I've been using the following command

```
autfilt '--stats=%r, %R' A.hoa --included-in=B.hoa
```

I think I am not interpreting the results correctly because `--stats` reports very small numbers
while adding `time` in front of the command reports much much larger numbers (several orders of magnitude larger).

What's the right way to measure the time it takes Spot to decide the inclusion?

Thank you.

Pierre.