4 hours is easy!
1. login
2. create a html file, put bitcointalk.org into iframe, auto refresh every minute with javascript.
3. go to bed
4. profit $$$
Good idea!
Just paste the following into a text file, save with extension .html in the file name, load the file into a browser, continue with step 3. above.
Getting 4 hours on BitcoinTalk
(No need for Javascript.)