@NTT - Use some honey (or blue potion) so that you have more stamina so that you can use your items more quickly. (What I did was use some honey, start off with the bottom left switch, threw a spear, jump onto the above ledge, turn around, hit the button on the right, and finally turned around and jump-throw the spear onto the last one.
NTT
The sewer below the Bandits' hideout - how do you get the three switches before the time runs out? Tried spears, bombs etc. :(