phd - How is a student perceived if he took more time to graduate?

Suppose, a student completed his MSc in 4 years, instead of 2 years, but has a CGPA of A.

Would he have any disadvantage as a Ph.D. applicant?

Edit:
I can think of two possible reasons:
1. financial difficulty.
2. took some time to develop the necessary knowledge to cope with some courses. For instance, he has to complete a course X (e.g. Stochastic Process) but found that he doesn't have the necessary background knowledge (e.g. Probability and Statistics) to obtain a good score. So, he took some time studied at home and then came back, and he scored an A or A+.