TM Timer for Microsoft PowerPoint version 3.5 supports Microsoft® PowerPoint® 2010 including the 64 bit version.
2010 
The timer add-in requires PowerPoint 2000 (or later ).
The add-in provides 3 different types of time displays, though only one is active at any given time. During a slideshow, it can:
1. show the current time
2. display the presentation elapsed time
3. or, count down the time remaining for the presentation. In addition, and optionally, it can terminate the presentation at the end of a separately configurable grace period.
Various parameters are easily customized.
A known issue is that the timer does not display the correct time when one uses the PowerPoint ‘Back’ feature to return to a slide. The reason for this is that PowerPoint does not inform the add-in that the slideshow has moved backwards to the current slide.
I hope to find a workaround to this problem but I don’t have a schedule for it.
From an email from Michael R:
Hi, I have been looking for a Powerpoint Countdown Tmer and found yours while googling.
I tried it and I must say that it is a good product.
Just one problem I am facing …..
Each time I close the powerpoint file all timer settings are lost. So I have to go to the TM ribbon and set it again.
Is this a bug?
Thanks.
MICHAEL R
Hi Michael,
Thank you for your compliments about the TM Timer add-in.
The settings are reset by design when PowerPoint closes. I am open to changing the design though I will not make any promise about when or even if that will happen.