Oil use on a Waverunner III

Just wondering howmuch oil a 1991 Waverunner III is suposed to use? Filled the Fuel and oil at the sametime. Fuel is almost gone and looks like I have only used about 3/4 or maby 1 quart of oil. Is this normal use? Seems easy on oil. I know my Yamaha Snowmobile is not this easy on oil..

Thanks Ryan