Time limit for recording audio on a PowerPoint slide

Save your .ppt or .pptx file as "web page" (.htm,.html) with a new name. PowerPoint will create a file with the new file name, and an .htm extension. It will also create a new folder, called yourfilename_files, containing all the embedded objects including sounds in your presentation. Open this newly created folder and you will see all the audio files listed. If your file is in .pptx format, you can also rename it as filename.pptx.zip and you can browse the sound and image files inside the zip file.

Edit: For Mac, you can use File Juicer to extract sounds from your PowerPoint file. See the relevant page for more info.

There's an Add-in you can download that will give you what you want. Seeing that you have the first part setup, you can use this Add-in to display the elapsed time on top of the current slide.

There are installation instructions on the website I have linked to, but for convenience I will include them here.

1. Download the executable and let it install the add-in to the default location. I've scanned the executable and the installed Add-in files for viruses and I can confirm that they are clean.

2. Once the Add-in has been installed, open PowerPoint and do the following:

File -> Options -> Add-ins -> (From the Manage drop-down at the bottom) select PowerPoint Add-ins and Go

3. On the resulting dialog do the following:

Add New -> select TM PowerPoint Timer (Ribbon UI) -> OK

The above will add a TM tab to the PowerPoint ribbon. On the configuration window for the Timer you'll be able to set a timer to show the Elapsed time. There's also an Update Display entry on the first tab, so make sure you set that to 1 second (the default is 10 seconds).