Sea/surface mail from UK

Hello, I have been waiting for a parcel from the UK since end of January. Instead of airmail the seller advised that she had been given the wrong postage quote at her local Royal Mail which made the item way too expensive for her to ship by that method so she sent the package surface/sea mail. She was quoted 6 weeks to arrive here. I am still waiting. My AP courier lass told me more like 3 months. Anyone had any experience with sea mail packages? I'm not very hopeful now that it will ever arrive.