He won’t nap😫😫

Mystery

We just recently started sleep training our 6 month old. He did amazing at night!! He slept through the night the first night. Our problem is naps. He’s never been very good at naps. We put him in his crib pretty much awake. He cry’s for 5 minutes max and falls asleep. But he wakes up after 30 minutes and just screams. Yesterday we did the cry and comfort thing for an hour and a half because I knew he was tired. He immediately fell asleep in my arms as soon as I picked him up. How long do I let him cry at naps? Do I just give up on that nap? Then he’s just tired and grouchy😫😫 Help!!