Personally, I'd prefer to go for the Raid on Friday + weekends. My play time during the week is typically pretty limited, maybe a couple hours a night. I'm pretty unfamiliar with the raid (only attempted once) but it took a long time to not even complete. So I guess if a couple members have solid strategies and can clear the it in a few hours (or are willing and available to break it into a couple nights) it's less of a concern. Just my two cents.