WOW! My bf or schizophrenic boyfriend NEVER replies but he alternately blocks and unblocks us...but I think that is different than what you are asking right? He is delusional and paranoid so I think in his case he wants to hear from us but is too paranoid to respond...but in regular people's cases, I think it depends on the person..my daughter for instance almost never replies right away and I don't take it personally..I guess it depends on the person and you gotta take into account the busyness of their lives..do they work, what kind of job, did something happen...best thing I found is not to take it personally....hope this helps...