K.H.
i own a daycare...and its hard to say because every baby is different, but if you trust your gut and do pop in visits, and you know that it is a safe place i would try a little longer. he will adjust when he gets into the swing of things. is this a home or center? and how do you know hes cried ALL day?! Most of my babies cry until their moms feet hit the pavement of my driveway! then its like an OFF switch! its hysterical that they learn that trick as young as 9 months old!!!
if its a center i would consider a home for now...but thats up to you. Good luck!