To freeze time completely, find a gateway between two areas, such as Oakvale to Barrow fields, for example. Cast Berserk and then Assassin Rush through the gateway. As soon as you pass through and the loading screen appears, hold 'down' on the thumbstick, so that as soon as the area loads you run back through to where you just were. Keep the thumbstick held down. When you load again, time should be frozen. This can be usefull for stealing, as Shop owners are also frozen. While this glitch is active, you can teleport anywhere while keeping time frozen. To unfreeze time, simply dig somewhere.