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.
Timewise on those days I should be flexible until like 1 AM local time, but ideally like 10 PM - Midnight (so... I guess that's 6 PM your time? Unless your clocks get screwed up since I know this is the period where different countries are out of sync on DST etc.)