Will Leo be angry for a long time?

Leo is arrogant. If you have a good relationship with him, it will be fine for a while, and you may forget this unhappy thing the next day. However, if your relationship is average, or if you have had a holiday before, it will be different. He is likely to hold a grudge and even break up. You can say something nice to coax you, don't wait for him to apologize to you.