Hi Jean Michel,
Thanks for writing. I can't really give you a schedule because it depends on your soil, the weather, etc. But I can say it's best to keep the soil moist, but not wet. That may mean watering daily or every other day when it's particularly hot and windy, but only every two or three days on more mild days, for example. I'd feel the soil around your plants --- if it's nice and moist, you shouldn't need to water. If it's starting to dry out, then I'd water it again.
---Justin, Senior Garden Editor, BHG.com