Been in security line for 1/2 hour and only half way through. Is this normal?

I allow at least 90 minutes (and preferably two hours -- longer for an international flight) to get through Security.

Especially during these times (summer vacation), you might have to wait longer.

1/2 hour is good progress if u are ESTA returnees then you can join a diff queue if not you will have to wait and spend the time...

Sadly yes

Yes