Maybe a day or more has passed.
At least a day has passed because we had the arrival of Vicki, the release of Barnabas, and the attack on Carolyn all on the same night - then the next morning during breakfast the family receives the news about Carolyn and then the events at the hospital take place. Presumably Barnabas then arrives that night, though there isn't any specific indicator in the script as to how much time has passed...