Arena can be stopped and started whenever you want thankfully.
Other noob tips for ez money: Once you play enough game you are able to get higher-paying quests on occasion. Once a day you can also cancel a quest to get a new one (just make sure not to cancel the intro quests!). This means if you always cancel the low-paying quests, every once in a while you'll pick up a higher paying one.
Other noob tips for ez money: Once you play enough game you are able to get higher-paying quests on occasion. Once a day you can also cancel a quest to get a new one (just make sure not to cancel the intro quests!). This means if you always cancel the low-paying quests, every once in a while you'll pick up a higher paying one.