I'm not sure about that 18 Feb 1789 Burial - there are 2 different registers for the same Burial at Dunstan Stepney; both list her with the same people being buried before and after her - so it is the same person....
One of them, for Eliz'th WHIFFING, does appear to list an age - and as far as I can work out, it says 9h - which I take to be 9 hours? The 'P' stands for Poplar, as in 'at Poplar', as per the other register.
Cheers
AMBLY