Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
B. L. Graham
Table title:
Head coaching record
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Season </th><th colspan=1 rowspan=1 > Team </th><th colspan=1 rowspan=1 > Overall </th><th colspan=1 rowspan=1 > Conference </th><th colspan=1 rowspan=1 > Standing </th><th colspan=1 rowspan=1 > Postseason </th></tr>
<tr> <td colspan=9 rowspan=1 > Ole Miss Rebels (Southeastern Conference) (1949–1962) </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1949–50 </td><td colspan=1 rowspan=1 > Ole Miss </td><td colspan=1 rowspan=1 > 8–17 </td><td colspan=1 rowspan=1 > 4–13 </td><td colspan=1 rowspan=1 > 12th </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1950–51 </td><td colspan=1 rowspan=1 > Ole Miss </td><td colspan=1 rowspan=1 > 12–12 </td><td colspan=1 rowspan=1 > 5–9 </td><td colspan=1 rowspan=1 > 10th </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1951–52 </td><td colspan=1 rowspan=1 > Ole Miss </td><td colspan=1 rowspan=1 > 15–11 </td><td colspan=1 rowspan=1 > 8–6 </td><td colspan=1 rowspan=1 > 5th </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1952–53 </td><td colspan=1 rowspan=1 > Ole Miss </td><td colspan=1 rowspan=1 > 14–11 </td><td colspan=1 rowspan=1 > 5–8 </td><td colspan=1 rowspan=1 > 7th </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1953–54 </td><td colspan=1 rowspan=1 > Ole Miss </td><td colspan=1 rowspan=1 > 12–12 </td><td colspan=1 rowspan=1 > 7–7 </td><td colspan=1 rowspan=1 > 6th </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1954–55 </td><td colspan=1 rowspan=1 > Ole Miss </td><td colspan=1 rowspan=1 > 8–15 </td><td colspan=1 rowspan=1 > 5–9 </td><td colspan=1 rowspan=1 > 9th </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1955–56 </td><td colspan=1 rowspan=1 > Ole Miss </td><td colspan=1 rowspan=1 > 10–13 </td><td colspan=1 rowspan=1 > 4–10 </td><td colspan=1 rowspan=1 > 10th </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1956–57 </td><td colspan=1 rowspan=1 > Ole Miss </td><td colspan=1 rowspan=1 > 9–12 </td><td colspan=1 rowspan=1 > 4–10 </td><td colspan=1 rowspan=1 > 10th </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1957–58 </td><td colspan=1 rowspan=1 > Ole Miss </td><td colspan=1 rowspan=1 > 12–12 </td><td colspan=1 rowspan=1 > 6–8 </td><td colspan=1 rowspan=1 > 8th </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1958–59 </td><td colspan=1 rowspan=1 > Ole Miss </td><td colspan=1 rowspan=1 > 7–17 </td><td colspan=1 rowspan=1 > 1–13 </td><td colspan=1 rowspan=1 > 12th </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1959–60 </td><td colspan=1 rowspan=1 > Ole Miss </td><td colspan=1 rowspan=1 > 15–9 </td><td colspan=1 rowspan=1 > 8–6 </td><td colspan=1 rowspan=1 > 4th </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1960–61 </td><td colspan=1 rowspan=1 > Ole Miss </td><td colspan=1 rowspan=1 > 10–14 </td><td colspan=1 rowspan=1 > 5–9 </td><td colspan=1 rowspan=1 > 9th </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1961–62 </td><td colspan=1 rowspan=1 > Ole Miss </td><td colspan=1 rowspan=1 > 12–13 </td><td colspan=1 rowspan=1 > 5–9 </td><td colspan=1 rowspan=1 > 9th </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=2 rowspan=1 > Ole Miss: </td><td class="highlighted"  colspan=1 rowspan=1 > 144–168 (.462) </td><td colspan=1 rowspan=1 > 67–117 (.364) </td><td colspan=5 rowspan=1 >  </td></tr>
<tr> <td colspan=2 rowspan=1 > Total: </td><td colspan=1 rowspan=1 > 144–168 (.462) </td><td colspan=7 rowspan=1 >  </td></tr>
</table>
Question:
How long did B. L. Graham coach at Ole Miss, and what was his overall record?
Answer:
B. L. Graham coached 13 seasons, compiling a record of 144–168.