The best way is always to stop when you are going good and when you know what will happen next. If you do that every day when you are writing a novel you will never be stuck. That is the most valuable thing I can tell you so try to remember it.
Ernest HemingwayUntil the dead are buried they change somewhat in appearance each day. The color change in Caucasian races is from white to yellow, to yellow-green, to black. If left long enough in the heat the flesh comes to resemble coal-tar, especially where it has been broken or torn, and it has quite a visible tarlike iridescence. The dead grow larger each day until sometimes they become quite too big for their uniforms, filling these until they seem blown tight enough to burst. The individual members may increase in girth to an unbelievable extent and faces fill as taut and globular as balloons.
Ernest HemingwayYou read what you have written and, as you always stop when you know what is going to happen next, you go on from there. You write until you come to a place where you still have your juice and know what will happen next and you stop and try to live through until the next day when you hit it again.
Ernest Hemingway