The game of Dungeons & Dragons Fifth Edition and its encounters is balanced on two basic premises.
Each adventuring day, a party of three to five adventurers should be able to handle six to eight Medium or Hard encounters (DMG, page 84).
Most combat encounters should last 3 rounds on average (DMG, page 274).
This means that the characters playing the game should have enough resources–including hit points, spells, special powers, etc.–to last roughly 18 rounds of combat.
In addition, the party should take at least two short rests per day to recover a portion of their spent resources.
This is currently running for me at about 2-5 turns of combat, NOT ACCEPTABLE. DnD not DOS please