I check mine after every ride.
I let it sit in the drive on the center stand while I change out of my gear - come out in a few mins with a paper towel and check the oil "per the manual."
One scoot I wipe the dip-stick, screw all the way home, remove and check; the Kymco, remove and wipe, set stick in the opening, remove and look at it.
Owner's manual tells you which way to do it.
Stig
really dislike oil "windows'!! (off center-stand, hold level, sit on or sit off?!, kneel down in the puddle and look in that dark hole...some use a mirror on a stick, some use a trained monkey)