You don't need to use cell ZZ10000 at all. Delete it. Forget it.
<table border="0" cellpadding="0" cellspacing="0" width="197"><tbody><tr style="HEIGHT: 15pt" height="20"><td class="xl65" style="BORDER-RIGHT: #f0f0f0; BORDER-TOP: #f0f0f0; BORDER-LEFT: #f0f0f0; WIDTH: 86pt; BORDER-BOTTOM: #f0f0f0; HEIGHT: 15pt; BACKGROUND-COLOR: transparent" align="right" height="20" width="114">
1/4/11 12:51 PM</td><td style="BORDER-RIGHT: #f0f0f0; BORDER-TOP: #f0f0f0; BORDER-LEFT: #f0f0f0; WIDTH: 62pt; BORDER-BOTTOM: #f0f0f0; BACKGROUND-COLOR: transparent" align="center" width="83">
#VALUE!</td></tr><tr style="HEIGHT: 15pt" height="20"><td class="xl65" style="BORDER-RIGHT: #f0f0f0; BORDER-TOP: #f0f0f0; BORDER-LEFT: #f0f0f0; BORDER-BOTTOM: #f0f0f0; HEIGHT: 15pt; BACKGROUND-COLOR: transparent" align="right" height="20">
3/5/11 6:56 PM</td><td style="BORDER-RIGHT: #f0f0f0; BORDER-TOP: #f0f0f0; BORDER-LEFT: #f0f0f0; BORDER-BOTTOM: #f0f0f0; BACKGROUND-COLOR: transparent" align="right">
60</td></tr><tr style="HEIGHT: 15pt" height="20"><td class="xl65" style="BORDER-RIGHT: #f0f0f0; BORDER-TOP: #f0f0f0; BORDER-LEFT: #f0f0f0; BORDER-BOTTOM: #f0f0f0; HEIGHT: 15pt; BACKGROUND-COLOR: transparent" align="right" height="20">
5/7/11 8:38 AM</td><td style="BORDER-RIGHT: #f0f0f0; BORDER-TOP: #f0f0f0; BORDER-LEFT: #f0f0f0; BORDER-BOTTOM: #f0f0f0; BACKGROUND-COLOR: transparent" align="right">
31</td></tr><tr style="HEIGHT: 15pt" height="20"><td class="xl65" style="BORDER-RIGHT: #f0f0f0; BORDER-TOP: #f0f0f0; BORDER-LEFT: #f0f0f0; BORDER-BOTTOM: #f0f0f0; HEIGHT: 15pt; BACKGROUND-COLOR: transparent" align="right" height="20">
7/7/11 11:13 AM</td><td style="BORDER-RIGHT: #f0f0f0; BORDER-TOP: #f0f0f0; BORDER-LEFT: #f0f0f0; BORDER-BOTTOM: #f0f0f0; BACKGROUND-COLOR: transparent" align="center">
#N/A</td></tr><tr style="HEIGHT: 15pt" height="20"><td class="xl65" style="BORDER-RIGHT: #f0f0f0; BORDER-TOP: #f0f0f0; BORDER-LEFT: #f0f0f0; BORDER-BOTTOM: #f0f0f0; HEIGHT: 15pt; BACKGROUND-COLOR: transparent" align="right" height="20">
6/7/11 3:17 PM</td><td style="BORDER-RIGHT: #f0f0f0; BORDER-TOP: #f0f0f0; BORDER-LEFT: #f0f0f0; BORDER-BOTTOM: #f0f0f0; BACKGROUND-COLOR: transparent" align="right">
21</td></tr></tbody></table>
Use this formula instead: =IF((TODAY()-A1<0),"",IF(A1="","",LOOKUP(TODAY()-A1,{0,2,6,11,21,31,61},{1,2,6,11,21,31,60})))
I get the following
<table border="0" cellpadding="0" cellspacing="0" width="192"><colgroup><col style="width:48pt" span="3" width="64"> </colgroup><tbody><tr style="height:12.75pt" height="17"> <td class="xl22" style="height:12.75pt; width:48pt" align="right" height="17" width="64">1/4/2011</td> <td class="xl23" style="width:48pt" align="right" width="64">12:51</td> <td style="width:48pt" align="right" width="64">60</td> </tr> <tr style="height:12.75pt" height="17"> <td class="xl22" style="height:12.75pt" align="right" height="17">3/5/2011</td> <td class="xl23" align="right">6:56</td> <td align="right">60</td> </tr> <tr style="height:12.75pt" height="17"> <td class="xl22" style="height:12.75pt" align="right" height="17">5/7/2011</td> <td class="xl23" align="right">8:38</td> <td align="right">60</td> </tr> <tr style="height:12.75pt" height="17"> <td class="xl22" style="height:12.75pt" align="right" height="17">7/7/2011</td> <td class="xl23" align="right">11:13</td> <td align="right">1</td> </tr> <tr style="height:12.75pt" height="17"> <td class="xl22" style="height:12.75pt" align="right" height="17">6/7/2011</td> <td class="xl23" align="right">3:17</td> <td align="right">21</td> </tr> </tbody></table>