What is a regular schedule for an oncologist?

Depends: You mean what is their job hours and schedule? That is highly variable. Some private practice oncologists work 12 hours 6 days per week. Many are now employed and work in clinic 4 d/wk with administration or family time. Academic oncologists may see patients 0.5 to 4 days/week with research and administration time in between. There is no one schedule for all oncologists.