This block time is not constant. It is long and short depending the mining situation. It resets because long period of long mining block time longer than targeted 1 minute per block after big ASIC miners left.
Overall the mining block time is close to 1 minute. From beginning of coin genesis time to now, 345 days, total of 706174 blocks. Did a math, roughly 40 seconds per block. Off by 40%, but not dramatically different.
The faster the blocktime, then the quicker to get mining reward half event. Originally the half will happen in 4 years, but 40 seconds per block, we get half in less than 3 years in stead of 4 years.
I know the problem of less caring ASIC miners, of course, I only hope it will not frustrate too much of the more long term oriented people.
Greez
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Yes, ASIC come in and drive up difficulty and then leave. They will jump in when it resets at low diff and make a killing on instant mining. Not happening for NENG mining. ASIC big miners still do the same rotation thing, but no instant mining reward for ASIC, the big profiting group on resets are NENG GPU miners. I think we figured a way of spreading out mining rewards to ASIC/GPU/CPU equitably among three groups of miners with current design of NENG DynDiff on top of scrypt while 51% attack risk is dramatically reduced.