The high from poppy tea lasts all day for me. It is most closely compared to morphine since that is the main opiate that you are getting out of the pods. Seeing that you enjoy the tea, you should take a lower dose of morphine than I mentioned before, because that dose is more for people that don't particularly like the morphine high. A dose of somewhere between 100-200mgs would be a good place to start.
hydromorphone is quite strong, but I've never done heroin so I can't really compare. I would compare around 20 mg of hydromorphone to 80 mg of oxy, but that doesn't really help you since you don't do oxy.
By me, .1 of heroin is like 60-80mgs of oxy. It usually never feels like less than 60mgs of oxy, and stronger batches could feel like 100mgs of oxy. These are my estimates from sniffing btw. So let's say that the OPs dope was like 60mgs of oxy per .1 which would make 1/3 of a gram about equal to 200mgs of oxy, which by your estimates would make that about the same as 50mgs of hydromorphone. Also, this is assuming that you are sniffing the hydromorphone. The BA varies a lot depending on the ROA, so this is very important to take into account when determining equivalent doses. The BA of Hydromorphone and morphine vary a lot compared to say, oxycodone which has a high oral BA with nasal not too far behind, and IV of course being 100. The BA of oral morphine is ~25% and the nasal BA is lower, and the nasal BA of hydromorphone is ~55% while its oral is ~33%.
These equivalent doses between heroin, oxy, morphine, and hydromorphone are all just estimates though, so don't just go and eat the doses that I think would be closest to 1/3g of heroin. It's just a guide as to how much of these other drugs you may be expecting to have to take to achieve the desired affects, but you should always start low and work your way up. As I have said, purity ranges a lot, and the H you were getting may have been pretty weak, especially considering that 6 poppy pods has you high. Speaking of which, poppy tea and morphine both usually take a good hour or so to peak, so don't go taking more until you have waited like 1.5 hours and have gauged it's effects on you.