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:
Furongian
Table title:
Subdivisions
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Epoch </th><th colspan=1 rowspan=1 > Stage </th><th colspan=1 rowspan=1 > Age (mya) </th></tr>
<tr> <td colspan=1 rowspan=3 > Lower Ordovician </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Floian </td><td colspan=1 rowspan=1 > 477.7 </td></tr>
<tr> <td colspan=1 rowspan=1 > Tremadocian </td><td colspan=1 rowspan=1 > 485.4 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=4 > Furongian </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Stage 10 </td><td colspan=1 rowspan=1 > 489.5 </td></tr>
<tr> <td colspan=1 rowspan=1 > Jiangshanian </td><td colspan=1 rowspan=1 > 494 </td></tr>
<tr> <td colspan=1 rowspan=1 > Paibian </td><td class="highlighted"  colspan=1 rowspan=1 > 497 </td></tr>
<tr> <td colspan=1 rowspan=4 > Series 3 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Guzhangian </td><td colspan=1 rowspan=1 > 500.5 </td></tr>
<tr> <td colspan=1 rowspan=1 > Drumian </td><td colspan=1 rowspan=1 > 504.5 </td></tr>
<tr> <td colspan=1 rowspan=1 > Stage 5 </td><td colspan=1 rowspan=1 > 509 </td></tr>
</table>
Question:
How long did Furongian last?
Answer:
Furongian lasted from 497 million years ago.