if(mc.thePlayer.ticksExisted % 20 == 0) {
mc.thePlayer.jump();
}
for every second that passes, you will jump
40 ticks = 2 seconds
20 ticks = 1 second
10 ticks = 0.5 seconds
5 ticks = 0.25 seconds
and so on
@dont_doubt https://scriptapi.liquidbounce.net/allclasses-noframe.html
Start by finding class named "Minecraft" and browsing all of its fields and methods.