What's the best time to check in to avoid the long line I see in some pictures?

No problem after 3pm. And yeah, those photos are from convention group check ins. The hotel has a convention center.

Just avoid the convention/group check-in and you'll be fine. Unfortunately, there is no telling when groups will check-in. So maybe grab a bite at the restaurant if there is a long line to let them pass...and send your husband to wait in line. LoL

Even with a line, they move people along.

It's hit or miss. Weekdays are certainly less crowded. I'd imagine checking in about an hour before the "check in" time or later at night would be your best bet to avoid lines. I've never waited in a line more than a couple minutes while checking in there.

Many of those pictures are from events they have since they have a convention center. We showed up at around 830 and got checked in within minutes