Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
I have that day off, so any time, preferably later in the day. You don't need to go out of your way to rearrange your schedule though; I have no issue with playing Thursday morning or Friday morning other than that I like to sleep in lol