How much the tip needs to be for one hour massage ?

Thank you all. I had the massage which I wasn't impressed with it at all but I still feel bad and I tipped $20

You leave whatever you like. The normal tip is 15-20%

10 to 20

$20 for one hour massage

I usually leave 15 percent of the cost for my massage

$15 to $20 depending on how happy you are with the massage.