There could be a few reasons why your oil lamp wick is burning so fast. One possibility is that the wick is too thick and is not allowing the oil to flow through it properly. Another possibility is that the oil you are using is too thick and is not being vaporized quickly enough by the heat of the flame. Finally, it is also possible that there is something wrong with the burner itself and it is not providing enough heat to vaporize the oil properly. Whatever the reason, if your oil lamp wick is burning too fast, it can be a nuisance. If you find yourself constantly having to trim the wick or replace the oil, it might be time to try a different type of lamp altogether.