How many days does it take to post 48 hour signed for mail? (UK only)?

I posted my Iphone that I want recycled. I'm rather worried what has happened as the recycling people haven't received it, how many days does it take to be received by them? I posted it Last Thursday 27th of June in the afternoon

2 working days. 24 hours in a day.

Well friday would have been the first 24 hours and monday the second 24 hours. I would expect them to have received it no later than today's delivery.baring in mind they likely have a lot of mail to get through i would expect some time tomorrow they would confirm that they have received the phone.