I'm currently deciding between graduate school offers and one of my main concerns with one program is the TA requirement. I would have to TA for at least 4 years during my studies. The official letter states that TAships require 20 hours per week, but I've been told that the workload is usually around or under 10 hours per week, but varies with class type (e.g., statistics) and time of year (e.g., exams). It usually includes attending lectures, holding office hours, administrative tasks, marking/monitoring exams, and teaching (e.g., labs).
I've asked around and I've received mixed feedback: some tell me to avoid TA as much as possible, while others say it is not a big issue. Keeping in mind that I am not eligible for external grants because I am not a US citizen, how much does TAing affect my research productivity and quality of life?
Any advice is greatly appreciated!