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Excel/Time interval question

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Question
I have a real brain buster for you. Sorry for crushing your brain in advanced. I have a list of 45 employees. I am allowed to export their time punches. Normally four punches per day, sometimes two punches. I would like to make a formula that tells me how many hours an employee worked, I would also like to see who has taken a break that is greater than 30 minutes. The export looks like this.
Emp ID  Date
51817   5/18/2015 3:00   ON
51817   5/18/2015 8:00   OF
51817    5/18/2015 8:30   ON
51817   5/18/2015 13:30   OF
51833   5/18/2015 4:56   ON
51833   5/18/2015 12:21   OF
51833   5/18/2015 12:59   ON
51833   5/19/2015 3:30  OF
51838   5/18/2015 18:49   ON
51838   5/18/2015 4:59   OF

PLEASE HELP!

Answer
I think your last one in the list should be 5/19/2015 4:59, not 5/18.

Assuming the first "ON" is in cell C2, then put these formulas in:
D3, fill down to D11 (D2 blank): =IF(A3<>A2,0,24*(B3-B2))
E3, fill down to E11 (E2 Blank): =IF(D3=0,0,E2+D3)
F3, fill down to F11 (F2 blank): =IF(D4=0,E3,"")

Column D is the time of the breaks.
Column E should be hidden and is a running total of D
Column F shows the total for each Emp ID at the end of the Emp ID list.

Select D3:D11, use conditional formatting with this formula: =AND(C2="ON",D2>0.5) and make any color you want. When you see the color, then the break was over 30 minutes.

If you want me to send a file with all this already done, I need your email address. Mine is bobumlas@hotmail.com
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Bob Umlas

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I`m a Microsoft Excel MVP (Most Valuable Professional) and have been since the inception of the program in 1995. I can answer every kind of Excel question except: API, Importing/exporting to other programs (powerpoint, word,...) Also check out my in-person training link at http://www.thumbtack.com/ny/new-york/excel-training/

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Worked with MS Excel since version 0.99 (on the Mac!). Was contributing editor to Excellence Magazine, having written >300 articles. John Walkenbach said of me "I finally met someone who knows as much about Excel as I do."

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Excellence, The Expert, Microsoft

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BA in math, Hofstra University, 1965

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Led sessions for the Convergence 2004-2006 seminar on Excel tips & tricks

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