Due to a loose Dog I ended up in the mud yesterday at Glasson Dock

My D90 and 18-200mm had a rough time, Luckily for me it was the Lens that came of worse and the body had some Camera Armour on it and luckily that brushed of once dry then I washed the Armour and left it for 24 hours to dry out. The camera is working fine but I've sent the lens back to Nikon it felt rather "Gritty" to say the least this morning.
Has anyone got any idea of how long Nikon take to clean a lens and what the cost will be

Please.
There is no broken glass as I had a UV filter on the front.
Ian