Step 1: Setup
1.1. Move all emails currently in your Inbox into a new "Old" folder
1.2. Set email to only check for new mail manually
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1.4. Get some to-do list method, be it software (wunderlist.com, omnigroup.com/omnifocus/), stickies on a wall, or whatever
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When you scheduled email checks in your calendar:
2.1. Open your email and check for new mail (since you set it to only check manually)
2.2. From the oldest forward, try to answer each email in 2 minutes or less. If you can't, make a to-do list item.
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2.3. Do this until all the emails are gone. This usually takes less than 30 minutes X 2 blocks, if you have only about 30 emails that you REALLY need to answer in a day.
Also, making canned responses (e.g., "I got this email and will respond XX") makes it much easier to write emails ≤ 2 minutes.