[unhammer]

> you probably need to remain constantly connected and moving data through Tor 24/7

I guess this is why they recommend running a (non-exit) relay – at the very least it increases the cost of figuring out when you're using Tor yourself.

[opendais]

It's still vulnerable to passive analysis as the other guy noted since if you control the ISP for the end-user you have some idea how much data is being pumped through an encrypted connection. [e.g. Is it just staying alive or pulling 50mb/s?]