I have tested some electrify build on my javelin paladin and while divine throw says : “Ignite and bleed chance from all sources is converted to electrify and effect related to bleed or ignite now depends on electrify instead” I have found that the later part doesn’t work.
I have tested Increased bleed duration (from Blood of the Exile) and found that it :
1 - Applies correctly to normal bleeds from hit.
2 - Does not work with self-inflicted bleeds. (Tested with bleeding hearth)
3 - Does not work with Divine Throw from the paladin javelin tree.
I have not tested ignite duration (or other items like Valdyr’s Chalice) because i don’t have items with it but i suspect the same bug thing applies.