What amount of time should be devoted to a proper back massage?

30 minutes minimum!

I like an hour.

I go for 90 minutes!

2 hours.

1 hour.

Depends on the masseur. If it’s your SO, you’re lucky for >15 minutes (which I think would be the proper amount).

I’m assuming in a non-professional atmosphere, in which case I think 10–20 minutes will suffice.

15 to 20 minutes before your SO gets bored would be good.

I give a pretty good massage, but my hands do fatigue after about 20 minutes.

When going to the spa, I book the longest massage available!

depends how hot the massage recipient is !!
usually after 15 min the massage can get uh… sidetracked.

If you are with a SO if it lasts longer than 15–20 minutes you are doing something wrong ;)

lol wow you beat me to it by literally half a second

great minds think alike ;)