not very high. i can alley over bouyes in the water very easily and ollie 180 (thats what its called) easily. dont worry when u spin it seems like u have more time in the air.
Try it outside the wake with tension on the line and you will find that you Ollie higher. Then when you get started going up, let go with the lead hand and you will spin around. Blake is right, it will seem like you are in the air longer.