How can I get around the Raid Boss time limit?
Solution 1:
Always change the clock to the past, not the future. The lockout is for 24 hours from the last time the system marked you as defeating the boss. If that time is in 2014, you won't be able to play the boss again with your clock set to normal until after that date (e.g., for Xbox, any time your console is online).
Solution 2:
Simply changing the system clock to 24 hours ahead (just change the day without changing the time) is enough to allow you to re-fight both Master Gee and Hyperious. There's no server-side checking so it doesn't matter if your online.
Note that for co-op, all players have to have their timers reset, you can't start the fight if someone in your party still has the countdown active. It flashes a message stating such if you try to shoot the boss (to start the fight), they'll take no damage and won't turn aggressive, nor will you be locked in with them. If you're farming these bosses as a group just have everyone change their clock at once.
Here's instructions for how to change your system clock in Windows, Xbox and PS3.
Solution 3:
Ben is correct. Another thing that can be done if trying to farm is the other non hosts players either alt + F4, or sign out fo the respectivive servies right before either boss dies. Or turn power off. Just make sure it doesn't save for the 3 non hosts. Then rejoin after he is dead. This won't give credit for boss but will allow a group of 4 to farm the boss. Also an assassin, zero, with the bore ability can damage hyperius fully throughout the fight. The shield counts as an enemy so in effect dealing double damage, even more if you can line up the bots.
So you can kill hyperius fairly quickly without worrying bout the bots.
Solution 4:
Not to worry, a recent update has fixed this:
From the patch notes:
- Disabled the daily lockout for raid bosses
Feel free to destroy Hyperius or whomever as many times as you'd like!