As a new player need clarity/help on a couple of questions please.

Jobs

I'm on the journey to become a white mage. At 30, I have to switch to level a THM to 15 and leveling is without my conjurer skills or equipment gained so far and in essence start over. So I really have to level 45 levels before becoming a white mage?

If I want to multi-class and try something else like a bard, I have to level an archer for 30, then switch to Pugilist for 15 levels to then do a quest to become a bard?

So I have to essentially re-start my character 4 times; level twice to level 30, and twice to level 15 to have a level 30 white mage, and a level 30 bard?

Second question: Mounts
I have completed my class quest up to the point I need to gather 2000 of my company's currency to be able to buy my ability to unlock a mount. I've bought the collectors edition that gave me a mount. How long does it take to gain the 2000 seals?

Thank you kindly for your help!