I think I know the basis for the quote, they looked at the rate to drop the subframe only; which consists of a whole mess of unnecessary work to R&R the rear swaybar. I was at my independent this morning and he checked the job description for me, and sure enough, in addition to releasing the sway bar links, it calls for removing the exhaust system, undoing the emergency brake cable, disconnecting the rear brake lines and re-bleed on replacement, removing the drive shaft, releasing the rear shocks, and possibly undoing the fuel lines. There's a separate time estimate for the rear sway bar, which is less than half an hour, but the "note" on the estimate says that you have to add the subframe work. The subframe only has to come down a matter of inches to R&R the sway bar.