Fallout 3 power armour qyestion?

it will take about 4 to 6 hours,you first have to find your dad witch is in a vault and it is under a garage,its west of megaton,i don't no if you can just skip and go right to the vault but you can try,but after you save your father you will have to go back to project purity after being attacked by the Enclave, you and Dr.Li try to escape then you will come up at the citadel then Dr.Li will yell at them to let you in,if you want a walk thought visit the website below