Sandman is correct. Time your songs. Incidentally, performance is a quite different to practice. In practice you might stop at an error and correct it. In performance, stopping and correcting should be so rare as to be almost non existent.

I wonder how many people actually 'practice performing'? Set up a space and imagine it as a performing space. Go through a prepared set list without notes. Stand if you would perform standing up and time the whole thing. Too much preparation can make a performance stale but some preparation is helpful.