Am I crazy??

Do you guys get mad or annoyed if your significant other takes FOREVER to text you back even on their day off?? My boyfriend works a lot so I totally get it if he can’t text back throughout the day but when I know he isn’t busy and he just reads my texts but then never replies or takes HOURS to respond I get a little frustrated. I am usually really patient but it has been happening a lot lately and he lives like an hour away so it’s not even like we get to see each other all the time. Do I sound rediculous for being annoyed about this or should I just let it be!?