Just doing some off-the-cuff numbers:<br /><br />Middle of the Jurassic was somewhere about 160M years ago, IIRC.<br /><br />160,000,000 * 0.73 = 116,800,000 seconds / 60 / 60 / 24 ~= 1,352days of drift over the course of 160M years.<br /><br />Assuming your given is correct, I calculate:<br /><br />24-((1352 /160000000) *365.2524 *24*60) = 19.556hrs /day in the height of the Jurassic, give or take my rounding errors.<br /><br />I am a bit sleepy, as this is exactly my weakest time of the day, so I'll happily stand corrected. <div class="Discussion_UserSignature"> <p>.</p><p><font size="3">bipartisan</font> (<span style="color:blue" class="pointer"><span class="pron"><font face="Lucida Sans Unicode" size="2">bī-pär'tĭ-zən, -sən</font></span></span>) [Adj.] Maintaining the ability to blame republications when your stimulus plan proves to be a devastating failure.</p><p><strong><font color="#ff0000"><font color="#ff0000">IMPE</font><font color="#c0c0c0">ACH</font> <font color="#0000ff"><font color="#c0c0c0">O</font>BAMA</font>!</font></strong></p> </div>