I knocked together some PHP code using the YouTube API to simply fetch my YouTube subscribed to channels and list the hours/days/weeks/months since last upload.
You can find the code on Gist or in the spoiler at the bottom of this post.
I came up with this as a little challenge to simply list the channels i was subscribed to and the time value since they last uploaded a video, here is a small portion of the output:
If you want to use this code yourself all you need is your YouTube channel id and a YouTube api key. Add these into the code at lines 4 and 5.
Here is the php code