Depends on size
Pituitary adenomas are now most commonly done via a transnasal endoscopic approach.
The typical tumor that is 1-2cm and round in shape is removed readily. Patients tend to go home within 1-3 days. Cerebrospinal fluid leakage or problems with the hormones may prolong the hospital stay. The size of the tumor/how high it protrudes into the brain may make surgery more difficult and recovery slower.