On my UA flight last August, the FAs did at least 4 rounds of beverage service on the 4 hour ORD-SFO flight. The first class FA also offered free wines as well and offered me some without checking my ID. Although I was tempted, I had to turn down the offer
The flight also served lunch as well. Overall it was a great flight, albeit delayed for 3 hours, and the FAs were really really friendly.