just found this

Overs bowled slowly today will NOT be lost (assuming no bad light etc). The rules are DIFFERENT for the last day compared to the other days. The last hour (last 15 overs) will be called at the completion of the 83rd over WHATEVER THE TIME.

On the last day, a minimum of 75 overs (or a minimum of
15 overs per hour) shall be bowled during the playing time
other than the last hour of the match where clause 16.1.6
below shall apply. If any of the minimum of 75 overs, or as
recalculated, have not been bowled when one hour of the
scheduled playing time remains, the last hour of the
match for the purposes of clause 16.1.6 shall be the hour
immediately following the completion of these overs.

Posted By: SCC 26, Aug 15, 15:58:35