Dad chose hospice and is frustrated it's "taking too long." Any thoughts?

About 2 weeks ago my dad had a major heart attack, when taken to emergency we were also told his kidneys were failing, his congestive heart failure was worse and he had pneumonia. He'd been borderline on a lot of this but the heart attack caused everything to go downhill fast. We did treatments for 5 days. He was barely conscious, needed a bipap and feeding tube. When we heard he was getting worse he was able to communicate that he didn't want to live like this. I always knew he didn't want any artificial support like feeding tubes. When we stopped treatment the hospital recommended we set up hospice and we did. He's in a facility now. No meds other than comfort, no food in over a week by choice and only small amounts of water. He perked up in hospice. Seemed brighter and our assumption was he was relieved we were following his wishes. No one thought (especially professionals) he'd last 3 days but it's been 2 weeks. He's having some confusion which the nurse attributes to the toxins from the kidney failure but he keeps saying "I should be gone by now" he's frustrated he's not dead and everyone is surprised he's hung on. He's seen all family he wants to see, says there is nothing he needs and when we ask how he feels he says "just waiting" it's a bizarre situation, any thoughts? He has not changed his mind by the way. These last few days he has been sleeping more.