How to set choice limit of given number on ModelMultipleChoiceField in Django?

Hi there, I got a following Form-Class:


class CustomUserprofileInterestsForm(forms.ModelForm):

    interests = forms.ModelMultipleChoiceField(
        queryset=Interests.objects.all(),
        widget=forms.CheckboxSelectMultiple)


I want to limit the choices for example to 6 of all displayed.
Is it possible with some optional arguments I don't know somehow?

Best regards.. cheers!

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