Understanding French time perception is crucial to avoid misunderstandings.
Consider this conversation:
Don’t forget that “8 jours” simply refers to a 7-day week and “15 jours” means 2 weeks.
In the same vein, one might say “lundi en 8” to refer to the Monday occurring a little over a week from now, not to be confused with “lundi prochain” (next Monday).
Good luck scheduling your next meetings and vacation days!