12 week old only awake 4 hours a day

I’ve tried, but cannot for the life of me get this boy to be awake any longer than he wants to be. If I miss his tired cues, or try to extend his awake time, he will get over tired (there’s a very fine line between tired and overtired with him) and if I miss it, he’ll cry uncontrollably. He has a feed, I’d awake for one hour, then will sleep for two. Wake again, feed, then back to sleep after an hours play, for two hours. He sleeps thru the night. So he only has a maximum of 4 hours awake time per day. Is this normal? What can I do to lengthen his awake window without him screaming to be put to sleep?