Lowering a car effect toe settings quite a bit so waiting that long could end up in significant inner or outer tread wear that can continue to get worse as a wear pattern can set in.
Driving the car will settle the springs far quicker than parked, more bumps the same so if you drive a lot you only need a few days for settling to be done. Best not to really drive the car fast or work it hard in the corners until settled and then aligned.
OR, take a tape measure, some masking tape, check the toe and set it now then reset it later and use other simple tools to do the alignment DIY.
Alignment shops generally do sloppy work to be within a wide range of factory specs where are not very precise and often they do not setup the equipment right, best to learn and do your own alignments, I have since the 70s's including full out race cars.