Realistically, installation at a shop with proper tools should take about 3 hrs max. (I DIY'd mine in 6 hrs w/o a lift or air guns) Provide them with the DIY I wrote in the DIY section. Also you should provide them with the tightening torques I wrote in the Suspension section.
$300 for an alignment is total BS. BMW dealerships charge between $100-$150 depending on your location. And I would recommend getting an alignment at the dealer because they have the proper alignment specifications/machines/tools/techniques.
Also the manual the shop refered to probably indicates time req'd for replacing more components than just the springs. That's why it says 5 hrs.
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