How Much Can Fit
The most basic version of the iPod Touch, which was the eight GB version in older models, can hold an average of 1,750 songs. It can also hold 10 hours of video and 10,000 photos, but these numbers are only true if you isolated the iPod Touch to just these items. The 16 GB iPod Touch doubles this at 3,500songs, while the 32 GB version doubles that number and holds about 7,000 songs and the 64 GB model does a final double at 14,000 songs.
The same is true with video, as the 16 GB model can hold 20 hours of them, the 32 GB version can contain 40 and so on. It is more difficult to break down the number for movies to a concrete answer as the list is given based on hours and not individual files, but you can easily break this down to average movie or television show length.
One of the less taxing elements of the iPod Touch is the apps themselves, which are relatively small and take up comparatively little of the storage space for what they are able to do. This is even more difficult to determine than media as they each have their own size, and this can be a huge range.
How many apps an iPod Touch can contain really depends on the types of apps. Some people put the estimate at around 129 per eight GB of storage space, which is more than you will be able to show on all the available pages. This means that you will have to use Searchlight to find some of your apps.
This has a huge variability, and if you have apps that are difficult to download via Wifi because of their size then you will likely be allowed fewer apps. Large-scale games often take up much more, which can indicate games that you have to purchase from real developers.
When you are determining how many apps on your iPod Touch, start by deciding whether this is going to be used mainly for games, business, contacts or utilities. This is really going to help you to figure out how much you can expect to put on there, but it is always easy enough to delete the ones you no longer use and replace them with new apps.
It's difficult to break down the movies number to a concrete answer as the list is given based on hours and not individual files, but you can easily add up the lengths of the movies and see.