Is it possible to launch an placement on all the lessons at once?

We strongly advise you not to launch the placement on all lessons. Proceed by series and prioritize the lessons that are the longest and/or consume the most resources (high school specializations, complex lessons, co-teaching lessons, etc.).: the software will take less time to perform its calculations if you proceed in this order.

Placing by small series of lessons also allows you to effectively resolve failed lessons as they appear.