Using rc.local, sys-firewall, and wondershaper to modify network speed during certain times

When I am done with work, I sometimes stream Hulu, usually between 6 PM to 9 PM. During this time, I would like my Qubes system to have a much more limited speed.

I found a post on ubuntuforums about creating code for wondershaper to do this automatically. (Unhappy with Wondershaper, Other Bandwidth Limiting Options?)

Modifying the code in this post, if I create a script called, and inside that I write:

1 8 * * * /sbin/wondershaper eth0 300 300 >/dev/null 2>&1
2 1 * * * /sbin/wondershaper eth0 clear >/dev/null 2>&1

and then place this in my firewall qube in the rc.local directory and make the script executable, should that allow my qubes system to still run at a reduced network speed while I stream Hulu and then automatically return to full speed after 9 PM?