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This is a common trap that we have all fallen in to. But if you don’t break out of it, you’ll lose your thrill of playing which is very precious.
You definitely want to spend less than 40 minutes and mark that sucker complete! That might be only 10 minutes, in may case I’m retired and feel I can afford a bit more. Your best learning comes in the struggle so I like to stay in that mode for a bit, usually ends up being in the 15 – 30 minute range. Then I mark it complete and if possible I’ll come back to the lesson later (same day or another day).
If I am going to “~perfect” (and I don’t mean that word literally) a challenge it will be in the weeks that follow. I’ve probably played the Bon Jovi (Sambora Sweetness) a couple hundred times (takes maybe 10 seconds), I play the Hotel California chord progression almost everyday for a minute or 2.