AstraZeneca Sales Representative interview questions

after submitting a cover letter and resume, i was asked to do an online mock interview questions. Then i was invited to meet with the manager for a casual chat. she informed me there will be 5 other stages of interview. i did not proceed to next stage afterwards. to be honest i already have a fulltime job in healthcare and it would have been very hard to attend five more interviews in person. i said that to them to give me notice if you need me to attend more interview. i cant understand why they cant screen everything in one go rather than 5 separate interviews, this i thought a very long process. Ok to apply if you got plenty of time and no other job to attend to, not ok if looking for people who already are in fulltime employment.