I'm wondering how long is an appropriate period of time in which to return a text? Often I may be busy with an extended date or other engagements and I can't respond to a text. I don't want to be rude and not respond, but if 4 hours or sometimes more have passed, should I respond then? I don't want to disturb someone when it's not a good time. Many times someone may have been responding to an ad I placed at the beginning of the night and now it's midnight, so do I even bother answering? Or if someone texts me later in the evening and I was already sleeping, should I respond the next day?