A day has 24 hours, if someone whose interested in you doesn't text you within the next 5 -10 hours then it would then they definitely would with ink the next 5-10 hours, compared to someone who has no interest in you and won't message you back because you are not a priority.
If it has been a Month of Mondays... Move on. However, if he is this Bad Text Tom who only Pushes a button in a once in a Blue Moon, then either Accept him for What he is, which is not Serious. Either Leave him in your List of Contacts or Delete his Name all the Same, that is, if he even does Make an Effort to Text. Good luck and No Sending right now. xx
If I were you I wouldn't fret over it. Make sure that others are aware that you are on the market. If you initialized contact and he has dropped the ball then keep on going. If later on he picks the ball up and wants to continue the game then it's up to you at that point.