15 minutes per level is EXACTLY where you want to be. Anything faster than that is kind of insane.
I haven't actually been to wetlands in like...10 years. XD Good to know it's worth doing!
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The part about the belt is covered early on in the guide under the Preparation section. I didn't provide a wowhead link because what item you use will depend on what class you're playing. But the Legacy Valor/Justice vendor should have something you can grab for a couple hundred gold.
It's not an enchantment, but you should buy or craft an iLVL 100+ belt, gloves, or boots with a gem socket for use with the new 5% bonus experience gem: Insightful Rubellite. I used a vendor-bought belt from the legacy valor vendor in Orgrimmar, since it was convenient and met the minimum ilvl bonus.
Honestly, use whatever leg/shoulder enchants you can get your hands on. Because they're such an old item from previous expansions, the AH might not have anything unless you've got the specific crafting profession to custom build them.
Supposedly you can have a level 85 character enchant them, then mail the enchanted heirloom to your low level too and get the advantage straight away. I haven't actually tested this yet, TBH, since I don't have any characters sitting in that range.