Both attny's gave you excellent advice and I would only add look at the bill, did he or she no charge you for small matters here or there, call your attny and say to them this is my life i don't want to worry about the small stuff are you protecting me on the big stuff. Most lawyers will give you a discount on short calls and emails if they don't they should, and if they don't then you either have enough money not to worry about it or you should ask for a discount.
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Look at your retainer agreement that you signed with the attorney. How the attorney charges is spelled out in that document. I know that a lot of attorneys do charge in minimum increments. I hope this helps.
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It is ethical. You should sit down with your lawyer to go over the bills. In my fee agreement I charge in small increments, i.e. for each phone call and email. I often don't actually charge my client's for the quick phone calls or email, as they only take a few minutes. However, I do sometimes charge my client's for phone calls or emails, depending on the context and involvement on my part.
I also am more likely to charge for calls if the client calls multiple times a day with the same question.