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:
1985 European Rallycross Championship
Table title:
Calendar
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Round </th><th colspan=1 rowspan=1 > Date </th><th colspan=1 rowspan=1 > Venue </th><th colspan=1 rowspan=1 > City </th><th colspan=1 rowspan=1 > Country </th><th colspan=1 rowspan=1 > Winner (Div 1) </th><th colspan=1 rowspan=1 > Winner (Div 2) </th></tr>
<tr> <th class="highlighted"  colspan=1 rowspan=1 > 1 </th><td class="highlighted"  colspan=1 rowspan=1 > March 31 </td><td class="highlighted"  colspan=1 rowspan=1 > Thermoton-Ring </td><td colspan=1 rowspan=1 > Melk </td><td class="highlighted"  colspan=1 rowspan=1 > Austria </td><td colspan=1 rowspan=1 > Austria Friedrich Hainz </td><td colspan=1 rowspan=1 > Sweden Olle Arnesson </td></tr>
<tr> <th colspan=1 rowspan=1 > 2 </th><td colspan=1 rowspan=1 > May 19 </td><td colspan=1 rowspan=1 > Ahveniston Moottorirata </td><td colspan=1 rowspan=1 > Hämeenlinna </td><td colspan=1 rowspan=1 > Finland </td><td colspan=1 rowspan=1 > Norway Audun Ove Olsen </td><td colspan=1 rowspan=1 > Finland Matti Alamäki </td></tr>
<tr> <th colspan=1 rowspan=1 > 3 </th><td colspan=1 rowspan=1 > May 26 </td><td colspan=1 rowspan=1 > Svampabanan </td><td colspan=1 rowspan=1 > Tomelilla </td><td colspan=1 rowspan=1 > Sweden </td><td colspan=1 rowspan=1 > Sweden Anders Norstedt </td><td colspan=1 rowspan=1 > Sweden Olle Arnesson </td></tr>
<tr> <th colspan=1 rowspan=1 > 4 </th><td colspan=1 rowspan=1 > June 23 </td><td colspan=1 rowspan=1 > Circuit de Marville </td><td colspan=1 rowspan=1 > Marville </td><td colspan=1 rowspan=1 > France </td><td colspan=1 rowspan=1 > Finland Jouko Kallio </td><td colspan=1 rowspan=1 > Finland Matti Alamäki </td></tr>
<tr> <th colspan=1 rowspan=1 > 5 </th><td colspan=1 rowspan=1 > August 11 </td><td colspan=1 rowspan=1 > Duivelsbergcircuit </td><td colspan=1 rowspan=1 > Maasmechelen </td><td colspan=1 rowspan=1 > Belgium </td><td colspan=1 rowspan=1 > Sweden Anders Norstedt </td><td colspan=1 rowspan=1 > Finland Matti Alamäki </td></tr>
<tr> <th colspan=1 rowspan=1 > 6 </th><td colspan=1 rowspan=1 > September 8 </td><td colspan=1 rowspan=1 > Lyngås Motorbane </td><td colspan=1 rowspan=1 > Tranby i Lier </td><td colspan=1 rowspan=1 > Norway </td><td colspan=1 rowspan=1 > Sweden Anders Norstedt </td><td colspan=1 rowspan=1 > Norway Martin Schanche </td></tr>
<tr> <th colspan=1 rowspan=1 > 7 </th><td colspan=1 rowspan=1 > September 21 </td><td colspan=1 rowspan=1 > Lydden Circuit </td><td colspan=1 rowspan=1 > Wootton </td><td colspan=1 rowspan=1 > United Kingdom </td><td colspan=1 rowspan=1 > United Kingdom Trevor Reeves </td><td colspan=1 rowspan=1 > Norway Martin Schanche </td></tr>
<tr> <th colspan=1 rowspan=1 > 8 </th><td colspan=1 rowspan=1 > October 6 </td><td colspan=1 rowspan=1 > Estering </td><td colspan=1 rowspan=1 > Buxtehude </td><td colspan=1 rowspan=1 > Germany </td><td colspan=1 rowspan=1 > Sweden Anders Norstedt </td><td colspan=1 rowspan=1 > Norway Martin Schanche </td></tr>
<tr> <th class="highlighted"  colspan=1 rowspan=1 > 9 </th><td class="highlighted"  colspan=1 rowspan=1 > October 13 </td><td class="highlighted"  colspan=1 rowspan=1 > Eurocircuit </td><td colspan=1 rowspan=1 > Valkenswaard </td><td class="highlighted"  colspan=1 rowspan=1 > Netherlands </td><td colspan=1 rowspan=1 > Sweden Lars Nyström </td><td colspan=1 rowspan=1 > Finland Matti Alamäki </td></tr>
</table>
Question:
How long was The 1985 European Rallycross Championship held?
Answer:
The 1985 European Rallycross Championship was held across nine rounds starting at the Thermoton-Ring in Austria on March the 31st and ending at the Eurocircuit in the Netherlands on October the 13th.