~18 days ago it was 42 also
15 days ago it was 42
today it is 37
So it went from ~0 days/day to ~0.3 days/day. I'm forecasting that the rate will continue to increase.
Your information is wrong.
It constantly swings all over the place. One moment it is 30, then 35 days and then 47 days.
Fact of the matter; the estimated difficulty is still dropping and since the snapshot the estimate hasn't been under 30 days. And that is 3 weeks ago!!!
This means the interest in the share is still getting less each day and the estimated will stay the same. It will only get shorter when only the few die hard miners are left mining this. You have no idea when this will happen. But it will take at least one more month and quite possibly 2 at least.
What you will see happen is the same as the Ron Paul Coin has had in the past. Interest is huge > everyone mines > difficulty shoots through the roof > everyone stops mining > difficulty drops to an extreme > takes a loooong time for the amount of blocks to have passed > the blocks is past > everyone drops onto the coin again and mines like crazy > rinse and repeat.
you're right on re:RPC. oscillations may become the norm for PTS since every snapshot will cause a shock to the mining market. The built in lag in retarget will cause oscillations, no way around it without hardforking.
However, the trend is currently towards increasing hashrate (and is continuing the trend toast pointed out)
Time to retarget: 27d 18:33:18 (2014-04-16 20:56:31 UTC+9)
Network hashing speed:
Last 100 blocks: 5,183,071.87 cpm ETA: 33d 16:33:40
Last 50 blocks: 6,287,297.60 cpm ETA: 27d 18:33:18
Last 15 blocks: 6,675,888.98 cpm ETA: 26d 03:45:22
Last 5 blocks: 6,937,143.86 cpm ETA: 25d 04:06:52
so over the past 100 blocks hash rate has been increasing, most likely due to discussions on new DACs and a corresponding rise in PTS value.