Calculate time difference (Subtract the time range 10PM to 9AM) between two datetime fields using django annotate?

Question

I have to calculate the time difference between to DateTime fields, also keeping in mind to subtract the time frame 10 PM-9 AM for each transaction if it lies in.

The following code snippet saves the duration between those two fields but I'm unable to subtract the time frame 10 PM-9 AM from that duration for further use.

from django.db.models import ExpressionWrapper, DurationField

MyModel.objects.annotate(
     diff=ExpressionWrapper(F('field1') - F('field2'), output_field=DurationField())
)

Can anyone help me to solve this?