How many subjects are in computer engineering?

Well, that typically depends on the University and the country you are talking about. Because same course has the different syllabus and structures, and even the total time period for acquiring a computer Engineering degree.
The duration varies from a 3 year to 5 year for Computer Engineering. Obviously, if the university has got lots of the subjects, then syllabus will be large which ultimately requires a long time duration.
But 4 years of the duration for a Computer Engineering course is most commonly found in the entire world and in most of the universities. While, the number of subjects differ based on the credit hours and the syllabus. So, one can not claim a fix number for the subjects. However, there are 40 to 60 subjects in total and 10 to 15 subjects are to be studied in a year which generally consists of two parts termed as semester.