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:
The Who Tour 1973
Table title:
Tour dates
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Date </th><th colspan=1 rowspan=1 > City </th><th colspan=1 rowspan=1 > Country </th><th colspan=1 rowspan=1 > Venue </th></tr>
<tr> <th colspan=4 rowspan=1 > Grand Gala du Pop </th></tr>
<tr> <td colspan=1 rowspan=1 > 10 March 1973 </td><td colspan=1 rowspan=1 > Voorburg </td><td colspan=1 rowspan=1 > Netherlands </td><td colspan=1 rowspan=1 > Sporthal de Vliegermolen </td></tr>
<tr> <th colspan=4 rowspan=1 > First United Kingdom Leg </th></tr>
<tr> <td colspan=1 rowspan=1 > 28 October 1973 </td><td colspan=1 rowspan=1 > Stoke-on-Trent </td><td colspan=1 rowspan=10 > England </td><td colspan=1 rowspan=1 > Trentham Gardens </td></tr>
<tr> <td colspan=1 rowspan=1 > 29 October 1973 </td><td colspan=1 rowspan=1 > Wolverhampton </td><td colspan=1 rowspan=1 > Wolverhampton Civic Hall </td></tr>
<tr> <td colspan=1 rowspan=1 > 1 November 1973 </td><td colspan=1 rowspan=2 > Manchester </td><td colspan=1 rowspan=2 > Kings Hall </td></tr>
<tr> <td colspan=1 rowspan=1 > 2 November 1973 </td></tr>
<tr> <td colspan=1 rowspan=1 > 5 November 1973 </td><td colspan=1 rowspan=3 > Newcastle upon Tyne </td><td colspan=1 rowspan=3 > Odeon </td></tr>
<tr> <td colspan=1 rowspan=1 > 6 November 1973 </td></tr>
<tr> <td colspan=1 rowspan=1 > 7 November 1973 </td></tr>
<tr> <td colspan=1 rowspan=1 > 11 November 1973 </td><td colspan=1 rowspan=3 > London </td><td colspan=1 rowspan=3 > Lyceum </td></tr>
<tr> <td colspan=1 rowspan=1 > 12 November 1973 </td></tr>
<tr> <td colspan=1 rowspan=1 > 13 November 1973 </td></tr>
<tr> <th colspan=4 rowspan=1 > North America </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 20 November 1973 </td><td class="highlighted"  colspan=1 rowspan=1 > Daly City </td><td class="highlighted"  colspan=1 rowspan=8 > United States </td><td class="highlighted"  colspan=1 rowspan=1 > Cow Palace </td></tr>
<tr> <td colspan=1 rowspan=1 > 22 November 1973 </td><td colspan=1 rowspan=2 > Inglewood </td><td colspan=1 rowspan=2 > The Forum </td></tr>
<tr> <td colspan=1 rowspan=1 > 23 November 1973 </td></tr>
<tr> <td colspan=1 rowspan=1 > 25 November 1973 </td><td colspan=1 rowspan=1 > Dallas </td><td colspan=1 rowspan=1 > Convention Center </td></tr>
<tr> <td colspan=1 rowspan=1 > 27 November 1973 </td><td colspan=1 rowspan=1 > Atlanta </td><td colspan=1 rowspan=1 > The Omni </td></tr>
<tr> <td colspan=1 rowspan=1 > 28 November 1973 </td><td colspan=1 rowspan=1 > St. Louis </td><td colspan=1 rowspan=1 > St. Louis Arena </td></tr>
<tr> <td colspan=1 rowspan=1 > 29 November 1973 </td><td colspan=1 rowspan=1 > Chicago </td><td colspan=1 rowspan=1 > International Amphitheatre </td></tr>
<tr> <td colspan=1 rowspan=1 > 30 November 1973 </td><td colspan=1 rowspan=1 > Detroit </td><td colspan=1 rowspan=1 > Cobo Hall </td></tr>
<tr> <td colspan=1 rowspan=1 > 2 December 1973 </td><td colspan=1 rowspan=1 > Montreal </td><td colspan=1 rowspan=1 > Canada </td><td colspan=1 rowspan=1 > Montreal Forum </td></tr>
<tr> <td colspan=1 rowspan=1 > 3 December 1973 </td><td colspan=1 rowspan=1 > Boston </td><td class="highlighted"  colspan=1 rowspan=3 > United States </td><td colspan=1 rowspan=1 > Boston Garden </td></tr>
<tr> <td colspan=1 rowspan=1 > 4 December 1973 </td><td colspan=1 rowspan=1 > Philadelphia </td><td colspan=1 rowspan=1 > Spectrum </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 6 December 1973 </td><td class="highlighted"  colspan=1 rowspan=1 > Landover </td><td class="highlighted"  colspan=1 rowspan=1 > Capital Centre </td></tr>
<tr> <th colspan=4 rowspan=1 > Second United Kingdom Leg </th></tr>
<tr> <td colspan=1 rowspan=1 > 18 December 1973 </td><td colspan=1 rowspan=4 > London </td><td colspan=1 rowspan=4 > England </td><td colspan=1 rowspan=4 > Sundown Theatre </td></tr>
<tr> <td colspan=1 rowspan=1 > 19 December 1973 </td></tr>
<tr> <td colspan=1 rowspan=1 > 22 December 1973 </td></tr>
<tr> <td colspan=1 rowspan=1 > 23 December 1973 </td></tr>
</table>
Question:
What was the duration of the Who Tour in 1973 ?
Answer:
The Who Tour lasted from 20 November 1973 at the Cow Palace in Daly City, California, and ended on 6 December 1973 at the Capital Center in Landover, Maryland.