How to create the problem :
1.) Have a class which is parent acting as parent to
some other classes also.
2.) Add the time to the parent class.
3.) run htb.init timecheck (when it changes the
values .i.e run this command at the time specfied in
time frame of the class)
4.) run tc qdisc show
This should hangs your system or atleast your network
Interface should get hanged.