Don't stop the press

 When prime Barca used to play with their tikka taka quick style of play, they prioritized keeping possession over the ball and making the opponent work for it. When the time that they lost the ball came. They weren't happy as they have to do the job they wanted their opponents to do. 

Because they want the ball back so desperately they came up with a time limit, which is 5-6 seconds. Within this time they were meant to win the ball back from the opponents. How do you achieve this?, they used to swarm the opponents and outnumber them in a certain area of the pitch and force the opponents into making a mistake.

When your coach asks you to do the same thing (he will). If the time you take to win the ball extends over 6 seconds, don't stop. You can never know how much time it will take. You might win the ball 2 seconds later or 10 seconds, but constant pressure will lead you to win the ball. 

That's it