The 42-year-old believes this amount of races, with some weekends having a sprint element as well, is just too much to keep up for several years in a row.
When you add a significant number of marketing events to that already hectic schedule, things quickly become borderline for the drivers.
Neither Fernando Alonso or Lando Norris managed to qualify in the top 10 in Mexico
Alonso: There are too many races
"I like it keeps the DNA," Alonso said of modern F1 to Fox Sports MX.
"To always go to the extreme in everything, the cars, the drivers, the tracks. That is not possible to replicate.
"What I don’t like? I think I like it all. Oh, well, maybe the calendar.
"There are too many races. 24 of them, plus sprints, plus marketing events. Maybe we have to take a look at that in the future."