I've been playing the guitar on and off for over 3 years. Since then I've learned a lot about how the guitar works and better ways to practice.

I can play all the basic chords in time except for the G chord and the C chord. It's driving me nuts and I've been practicing it for nearly 10 hours over the course of 4 days and I still can't get it in time. Is this normal? Should I be having such a difficult time with something as simple as this? Thanks.
on and off ... I wouldn't say so. The G and C chord as pretty much fundamental stuff - things your should learn at least in your first year even if on and off.

All I can say is you have to keep trying.
how are you having trouble? your fingers cant reach or are they hitting the other strings? i had problems with them for a while then a friend showed me that i was using the wrong fingers on the wrong strings.
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I always found those 2 chords to be the easiest, but everyone learns differently..just keep at it, go slow and do it perfect then increase speed of changing chords...I had a hell of a time with F.
everyone learns at different paces just keep at it you'll get it eventually, and when you do your on top of the world.
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Pffffffft schematics

Although i guess the OP will have to get used to reading them if he's going to buy a bugera..
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along with fire escape routes...