Twitter will only have room for extremely hardcore employees who put in long hours at high intensity, the companys new owner Elon Musk told staff Wednesday morning.

Going forward, to build a breakthrough Twitter 2.0 and succeed in an increasingly competitive world, we will need to be extremely hardcore. This will mean working long hours at high intensity. Only exceptional performance will constitute a passing grade, Musk wrote in an email to employees .

Those who wish to work normal hours at regular intensity can leave the company with three months severance, according to the note.