Determine yardage of unlabeled gift yarn

A friend bought 5 skeins of yarn for me in Italy. No labels. It is a lovely 2 ply wool that I am anxious to knit up. Is there a way to determine how much yardage I have. Do I have to rewind the skein, counting yards as I go?
Thanks

Unfortunatly that would probably be the easiest.

You can determine if it’s sport, worsted or bulky weight, then weigh them, figuring an average number of yards per 50g for that weight and that can help. Or measure off about 10 or 20 yards and weigh that.