What if my husband doesn't reply to the text message in time? Sometimes I don't answer at all, but I haven't sent you another message once.

Maybe you are too sensitive. If you can't reply to your message in time during working hours, I just hope you don't mind that he replies too late when he misses you. But you can ask why he always replies to your text messages so late. The most important thing between husband and wife is communication, not suspicion. Trust your husband before you figure things out. Similarly, if your husband really has a woman, then he doesn't have to reply to your text message very late. This seems to have no logical relationship.