if you don't care about watching tv on an actual tv then you can always use streaming sites.
ttmeiju.vip is my first choice for english tv shows, youku,qqvideo, and others for anything not english. no downloads required for these sites though the option is there if you want it. and of course free
I did this once, from Hk to home(canada) I stopped in beijing I think for like 8 hour layover and was not allowed to leave the international departure area since my flight was a reasonable time away, customs never gave me any trouble
most places I have worked at have 1 hour classes with 5 minute break in the middle, or 1.5h classes with 10.
per hour pay is usually higher then salary if you break it down. salary is safer because its always the same. for example you accept a job that says up to 20h a week and you only teach 18 hours your still paid the full salary, assuming you show up and work as your suppose to.
where as 200h part time may not be as stable and usually don't include work visas