This is over the most popular yoga teacher training method. It may be good to first get the idea of the training courses because there are many ways for yoga teacher certification.
Yoga teacher training classes are normally held at the yoga studios and can last for a period of one month to two years, but this depends on the depth of material to be covered. Yoga training sessions can be arranged to meet over the weekends and evenings in succession.
You can visit https://www.yogateacherstrainingindia.com/ if you are looking for yoga teachers in India.
For employed people, it's good if you find yoga training courses which are scheduled to take place over the weekends or in the evenings. It may be difficult to explain to your employer that your absence was a result of taking classes to become a yoga teacher.
Taking training at ashram yoga or retreat is a complete immersion without daily life interferences. There exists a living quarter for the yoga interns and the yoga staff. This is a good way of learning ways of becoming a teacher if you got no family or employer's obligations. It is a good condition to study yoga teacher training at the ashram as they function as universities.
Luxury vacation yoga training has become more popular than we expected. One can study yoga training at exotic locations. This is a complete immersion while studying yoga, but with all the 'creature comforts, this may be the training for you if got the financial resources.