Adopted adult male bearded won't eat

[Monkey girl]

Hi everyone,

My newly adopted adult male bearded dragon refuses to eat. I know he needs time to settle in (it's been 3 days) I'm just wondering how long does it normally take for a mature beardie to adjust to a new home? It's the refusal to eat or drink that concerns me. He's also very nervous in his enclosure, he pancakes and does not change positions at all. I even wake up in the morning and he's in the same position he went to bed in. His lighting and temps are correct (powersun MVB bulb 16" from him, temps are 100 on the hot/basking side and 80 on the cool side), humidity is 40%.

Im im just wondering the estimated time for him to start feeling up to eating or even moving around his tank? Just a concerned new mom!

Thanks everyone!