Once God has you prepared, it generally doesn’t take long for Him to have you mobilized.
God first had to get Gideon and his army into a position of complete trust and dependence upon Him. But once that was accomplished, God sent the orders to advance. Gideon had barely dispatched the bulk of his army when God told him to advance on the enemy.
Perhaps God did not want to take any further time, now that His servants were ready. Or perhaps God did not want his tiny army to have too much time to ponder the precariousness of their situation. Sometimes it is good to count the cost. At others, it is preferable to advance immediately without further analysis. God understood that, with his timid commander, the time to advance was now.
It generally takes much longer to prepare God’s servants than it does to use them. You will know when you are ready for your divine assignment. It will be when God tells you to advance. If you are not yet advancing; you are not yet ready.