well i am thinking if i had a problem and cant get a reach of helpesk live at 10:30 i'd probably say fuck it and go to bed or watch tv. would nit want tech suport to call me back 30 min after once i start my movie or sleeping. Also i am single... but i am sure some families would rather not be called back so to not wake up the kids, wive, room mate, gay lover ect...

So best solution is the to ask the client if he wants to ba called back