back in the mid to late 90s, I got a trial for compuserve that was a free 2 month trial. I liked it as as they provided dialup PPP access so was able to use it as full time internet access. It wasn't quite "2 months" of access though. It was 1500 hours of access (which in practice > 24*62).

However, their usage accounting software wasn't great. I had it setup to reconnect if the connection dropped, and they didn't do a great job seeing this, so they accused me of using 2-3k hours during those 2 months (should be impossible if always coming from the same #) and sent me a large bill (for the hours used over 1500). They eventually gave in when I showed them it was impossible and they could validate that the calls were coming from the same line due to the connection dropping and being simple reconnections.