Having a doc in the team means that you will always be healed

Missioning with a Doc - Team missions are just like solo missions, only there are six of you, so you can go six times as fast. Make sure to run Habbo credits from room to room as fast as you can so that you don't waste any of the doc's time. Also, remember that having a doc in the team means that you will always be healed, so there is no need to stop between fights to heal up.

Most good doctors have unlimited nanos so they will always be ready with the heals, making combat a cinch. Run into the largest room you can find and attack the middle mob. Make sure to stay in the large room as fighting in the ajacent room will likey cause less mobs to attack your team, which slows down the amount of experience you get and pisses off the doc.

To further save time, make sure to loot chests only durring or right after a fight--the doctor's frantic team heal spamming because of the fight you started will cover any incedental damage from trapped chests.

If the doctor takes aggro, let her keep it. She is the healer and it's easier for her to heal herself then to heal anyone else.