I fly out in a week. Parking is per day, not per 24 hour period, so leaving tomorrow and coming back Sunday is 2 days.
Parking is $12/day. Up to you to decide if the cost is worth it to you. I'm going for 3 days. Uber from my house is about $20. Will have my wife pick me up when I come back.
You should plan on being there about 10-15 before boarding. That's all the time you'll need to get through security and walk the 50 yards to your gate.