I’m on vacation and wrote this thread only after I completed my 4 hours of daily language study. I try not to study more than 4 hours daily to avoid burnout. Also, I searched the Internet for an article or even a study that addresses learning multiple languages simultaneously and came out blank therefore, I wrote one myself. So far, I have enjoyed all the feedback which have been very motivational. For example, I just completed 2 hours of study and set time aside to write this response :).