Yeah, I did those quest for the safari zone warden a few weeks ago. And I know how to do the wait x days too, if you use emulator then that's the easiest way;
Just set the PC Click at 23:59:55, wait till the tile is 00:00:05, repeat the time changing untill you have "enough days". But don't change the; Day/Month/Year, just the Hour/Minutes/Seconds.