When my Mum had her stroke several years ago now, it took over 6 hours and 3 calls from me to to 999 to arrive.

The crew that eventually arrived were very apologetic about the length if time it took them to arrive, apparently it was down to the call handlers incorrectly prioritising calls.

Despite the 6 hour delay Mum went on to make a surprisingly good recovery and was with us for about another 3 years.