Executive MBA are usually accelerated and require a minimum of 5 to 7 years of professional experience for admission. Additionally, Executive MBA programs are lock step programs - a class is selected and they stay together for the duration of the program. Approximately 10-15 hours per week. The amount of time depends on the expertise in a given class. No, but some group work is highly recommended.
Many students feel that group work is a significant learning enhancement.
I have heard that accelerated MBA programs are very intensive. The program is intensive. However, in recognition of the responsibilities of work, family, and school, frequent breaks from classes are included in the class schedule. Traditional grading is used. Students must maintain a 3.0 GPA to remain in the program.