I do think it's standard, but nothing to frown about.
Look at it this way: they need to
a.) get our records
b.) look them over THOROUGHLY
c.) meet us in person and make sure we qualify (heart and lungs strong enough, active lesions, yadda yadda)
d.) get approval from our insurance companies (which by itself can take 4-6 weeks)
e.) proceed with treatment
You wouldn't want them to do it fast.
Because instead they're doing it right.