Uh, no clue, that math on that would be very difficult to calculate, exceedingly complicated.

Have you ever been able to accurately predict the actual speed at which you download a torrent thats the size of a whole days worth of your regular internet usage?

Its basically a dynamic mesh network, you could run the math on a 100 different scenarios, get a 100 different results, and also have no clue which scenario is more or less realistic.

The way I2P works is by step one, encrypting your traffic, step two, bundling that into a bigger packet made out of those network-near you's traffic, that then has its own encryption around all that, and then that gets sent somewhere else.

So, upside is, even if your packets are intercepted... its basically impossible to figure out which subpart of the bigger packet is whose.

You only have the keys to your part of that bigger packet.

Downside of all this is that all that packet bundling takes time, and routing is dynamically reconfigured, so... yeah, doing a 'from principles' estimate is... I dunno, find a chaos mathematician specialist for a more precise answer?

Possibly also worth mentioning: You can use I2P as basically something like Tor/a VPN, to access the non I2P net, the normal internet, you do this by using what is called an outproxy.

Theoretically an outproxy could be just giving all its packets right over to the NSA, but again, you've got that kind of encrypted packet sausage going on, and the network is much more complex and distributed than the Tor network's smaller number of more centralized nodes.