couple hours? You can just unhook them from the top and swing them out. No need to completely remove them from the car. Just be careful of the paint on the car. Good idea to drape a big quilt or something across the fender. Messing around with coil springs and strut nuts can sometimes get out of hand. Big wrenches, odd tools involved, etc.
That's what I do too.... the quilt is a good idea... I haven't used a quilt, but will try it next time.
Timing... is a good question... the first time took me longer then a few hours because I also replaced the U-Joints of the half shafts. While I had stuff a part I figured why not... I also did the brakes front and rear, and replaced the wheel bearings in the front. But if your not doing all that... I would agree with the better part of a Saturday.
Good luck, and don't try and remove the pins in the rear "A" arms.