6k in 8 hours requires luck even at level 60. At level 41, I would say it's impossible. Definitely easier / faster to farm a GGR than grind plat to buy one at 41.
The first time I camped GGR (at the double spawn) it took 12 hours. Second time it took 4 hours. Third time it took 7 hours. All about luck.
With that said, you may be able to hold down the Ancient Cyclops camp in OOT soon. That's a decent cash spot. Although, it could take just as long to get the ancient ring as it does to get a GGR, if not longer.
Once you're in the 50's you can make amazing money - and exp - killing Felwithe guards. I did level 51-56 there on my Necro and made over 30,000p.
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