oil vacuum pump question

Im looking to change my oil using a vacuum pump. I have a 2011 sportsman 850 touring.
For those that already use a pump to change your oil:

How long does the tubing have to be to make it through the dipstick hole and get at the oil?
Reason I ask is that I see a pump for sale locally, but the tubing is only 12inches long??! seems like that might be kind of short.