How long can someone get tattooed consecutively?

[Graupel]

I'm a tattoo enthusiast who is currently living in the middle of Alaska and am planning a trip to All or Nothing eventually for large amounts of work at one time.

Question is... how long can someone get tattooed for consecutively without going into shock or compromising the immune system? My old tattooer from Anchorage said that after about two days the body can go into shock and greatly affect the healing process. Don't know if there is any truth to this as many of the artists at AoN have done full sleeves in 3+ days at one time.

Would greatly appreciate any input on this. Thank you.
-Graupel