Hi,
I think this will work for you, use formula in Z5:
<b>Excel 2010</b><table cellpadding="2.5px" rules="all" style=";background-color: #FFFFFF;border: 1px solid;border-collapse: collapse; border-color: #BBB"><colgroup><col width="25px" style="background-color: #DAE7F5" /><col /><col /><col /><col /><col /><col /><col /><col /><col /><col /><col /><col /></colgroup><thead><tr style=" background-color: #DAE7F5;text-align: center;color: #161120"><th></th><th>K</th><th>L</th><th>N</th><th>O</th><th>Q</th><th>R</th><th>T</th><th>U</th><th>W</th><th>X</th><th>Y</th><th>Z</th></tr></thead><tbody><tr ><td style="color: #161120;text-align: center;">3</td><td style="text-align: right;;">5:00 AM</td><td style="text-align: right;;">2:00 PM</td><td style="text-align: right;;">5:00 AM</td><td style="text-align: right;;">12:00 PM</td><td style="text-align: right;;">5:00 AM</td><td style="text-align: right;;">4:00 PM</td><td style=";">OFF</td><td style=";">OFF</td><td style="text-align: right;;">5:00 AM</td><td style="text-align: right;;">1:30 PM</td><td style="text-align: right;;"></td><td style="text-align: right;;">#VALUE!</td></tr><tr ><td style="color: #161120;text-align: center;">4</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;">#VALUE!</td></tr><tr ><td style="color: #161120;text-align: center;">5</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;">35.5</td></tr></tbody></table><p style="width:3.6em;font-weight:bold;margin:0;padding:0.2em 0.6em 0.2em 0.5em;border: 1px solid #BBB;border-top:none;text-align: center;background-color: #DAE7F5;color: #161120">Sheet1</p><br /><br /><table width="85%" cellpadding="2.5px" rules="all" style=";border: 2px solid black;border-collapse:collapse;padding: 0.4em;background-color: #FFFFFF" ><tr><td style="padding:6px" ><b>Worksheet Formulas</b><table cellpadding="2.5px" width="100%" rules="all" style="border: 1px solid;text-align:center;background-color: #FFFFFF;border-collapse: collapse; border-color: #BBB"><thead><tr style=" background-color: #DAE7F5;color: #161120"><th width="10px">Cell</th><th style="text-align:left;padding-left:5px;">Formula</th></tr></thead><tbody><tr><th width="10px" style=" background-color: #DAE7F5;color: #161120">Z3</th><td style="text-align:left">=SUM(<font color="Blue">(<font color="Red">L3-K3</font>)*24</font>)+(<font color="Blue">(<font color="Red">O3-N3</font>)*24</font>)+(<font color="Blue">(<font color="Red">R3-Q3</font>)*24</font>)+(<font color="Blue">(<font color="Red">U3-T3</font>)*24</font>)+(<font color="Blue">(<font color="Red">X3-W3</font>)*24</font>)</td></tr><tr><th width="10px" style=" background-color: #DAE7F5;color: #161120">Z4</th><td style="text-align:left">=(<font color="Blue">(<font color="Red">L3-K3</font>)+(<font color="Red">O3-N3</font>)+(<font color="Red">R3-Q3</font>)+(<font color="Red">U3-T3</font>)+(<font color="Red">X3-W3</font>)</font>)*24</td></tr><tr><th width="10px" style=" background-color: #DAE7F5;color: #161120">Z5</th><td style="text-align:left">=(<font color="Blue">IFERROR(<font color="Red">L3-K3,0</font>)+IFERROR(<font color="Red">O3-N3,0</font>)+IFERROR(<font color="Red">R3-Q3,0</font>)+IFERROR(<font color="Red">U3-T3,0</font>)+IFERROR(<font color="Red">X3-W3,0</font>)</font>)*24</td></tr></tbody></table></td></tr></table><br />