一会儿is not that long. See you tomorrow I will say明天见。 一会见means see you in several minutes or hour

-“一会儿见” means you will see the person later, not tomorrow but today. It can be a few minutes or hours. - If you see the person tomorrow, then you say "明天见“ - "thank you for today's class, see you later" in Chinese is " 谢谢你今天的课，一会儿见”. Hope it helps. :)