i have to write and presantation PPTs these days, so how to check the ppt time is very important for me. i get a time reminder for the requirement. it is called TM Timer for Microsoft® PowerPoint® . after install you will get a new tag called TM.
on the left corner, a time record will show as i want. So i can control the time the slide should cost.
please download it from:http://www.tushar-mehta.com/powerpoint/ppt_timer/index.htm
run the install execution, then go to powerpoint option, add-ins, change to powerpoint add-ins, GO,add new, point the file to TM PowerPoint Timer (Ribbon UI).ppam
this is very easy and nice,right? Hope this add-on can help you.