Why does it take about 30-60 minutes before someone find a block sometimes? Isnt a new block released every 3 minutes? it's about 1h 22m now since someone did last get a block.. Or did I miss something?
looking at
https://chainz.cryptoid.info/jif/ there has been 8 blocks in the last hour at the time of writing this post. From your previous posts you are mining solo so depending on your hash rate it can be debated as to whether that is the best method compared to using a mining pool.
the 3 minute block time is achieved when the hash rate and difficulty is relatively stable, currently with increased interest the mining power to difficulty ratio increased which saw quicker blocks but when mining was quickly removed the opposite is seen ie slower blocks. The difficulty calculation is based on the last 10 blocks.
You can see a similar result in bitcoin ie 3 blocks in less that 5 minutes through to over 30 minutes with no blocks. ie not exactly every 10 minutes.