My router allows me to set certain upload/download speeds during certain times.

I'm wanting to allow it, for example during 3pm-8pm during weekdays (when the kids should be doing their homework), they can only view sites which are primarily text based (school portal, NZHerald, Wiki etc), and any attempt to access Netflix would just be virtually unusable.  

As well as this, any attempt to upload (Instagram photos, Facebook etc would just be very slow).

I was wondering what speed you would recommend I set it as in terms of?
Guaranteed Upload Bandwidth (kb/s)
Guaranteed Download Bandwidth (kb/s)
Maximum Upload Bandwidth (kb/s)
Maximum Download Bandwidth (kb/s)

Looking forward to hearing from you - thank you for your help!

Thanks!