How can I find out hoe many objects have been used in an espace?

I have just created my first 'real' espace and have been asked the question by my manager how many objects I have used. How can i find this out?
This seems like an extremely strange request.  Would he be asking the same question if it was a .Net application?  And even if you came up with an answer, how does that help him?

Is it possible he's asking for SUs (software units)?  Since licensing is based on SUs, this would seem much more meaningful.  I know you can get this in Service Studio but I can't find it at the moment, probably because I'm on the personal edition.  Look there and you should see it.

Hope this helps,