time-consuming — requiring a lot of time to complete; taking a long time

a chef carefully chops an enormous pile of vegetables while multiple pots simmer on the stove behind them. Sweat beads form on the chef's forehead as they work methodically through mountains of carrots, onions, and potatoes. Hours have clearly passed as evidenced by the filled garbage bin and multiple completed prep bowls. The clock on the wall shows significant time has elapsed since the cooking began. Kitchen assistants move slowly between stations, each focused on their own lengthy food preparation tasks. Everyone appears tired but determined to complete their elaborate multi-course meal. a process requiring a lot of time to complete