Commenting in my corner of hundred acre wood goes thus.
Kids: Some say nothing or shyly lisp an answer that is whispered in their ears.
Teenagers: Generally stay shtum except the precocious pioneer at age 15 who answers three times per meeting.
Non-appointed brothers/ex appointed brothers who are not reaching out and sisters not pioneering and who are not elders' wives: Maybe one answer every couple of weeks.
As above but ex-elder in an almighty sulk but goes to meetings because Jehovah knows he is right: No answers ever!
Elders and MS's and brothers who pioneer: One answer per meeting.
Elder wishing to make a point: Three times per meeting.
Elder's wives: Two times per meeting
Pioneer sisters: Two/Three times per meeting.
Frustrated Single Pioneer sister: As many times as possible!