Hi. That's unbelievable.
288 MBytes for a 52 Sec. Video. That's not really acceptable. Not all have fast optical Internet connections. Some of us works with the expensive mobile connection.
Can you replace that? Some other Video have a good size. The introductory Video 'Fundamentals of Animation' for example takes 16 MB only for a 3 Minutes length. That's realistic.
Greetings