1 hour is too fast (and 100k too cheap if using most any speed leveling method). I found weaver to be particularly useful both in itself and for leveling other classes faster/ more painlessly. It's been my experience that the first crafting class you level will take you the longest if you do much of the actual crafting yourself. After that it gets progressively easier because you accumulate very useful cross class skills. I like weaver to start with because it provides a very good, if a bit bland, skill -- careful synthesis (I/II). It makes progress 100% likely instead of 90% while effectiveness is dropped to 90% for tier I, but raised to 120% for tier II. This means you can't unexpectedly fail a synthesis due to bad luck. Weaver also makes a lot of it's own gear, as does leather worker.

I like crafting (and gathering) more or less as its own game. You can make a lot of gil if you like, but it's fun even if you don't bother so much (perhaps more so if you're not trying to get rich). I would recommend leveling multiple classes if you're serious about it, as once you hit 50 higher level recipes more or less demand that you have access to most cross class abilities, and while leveling those abilities make it easy to HQ items for leve turn ins/ supply & provisioning/ personal use/ sale. It's also very helpful to level gathering classes with/ before crafting classes for obvious reasons, but it's not necessary and some people don't really like gathering very much.