If your relationship with the requestor is a mentor/mentee or you are their supervisor, then sure, go ahead and let them stew a bit to see if they can figure it out.

If you are in IT support, it isn't your job to treat every colleague like a child who needs to learn. It's your job to serve others and remove any IT-related barriers to their productivity.

When I was doing IT support, half the requests were things people could figure out themselves if I just waited. But I was there to make their job easier and make them feel supported. Making them wait doesn't make them feel supported or instill confidence. Knowing they could call or text and have an immediate response is a huge boost to their productivity and feeling of confidence vs. wondering if or when I might reply.