I am the holder for 6 months . I'll keep until the end of the year, at least . ICN,STOX,SONM and 1ST .
I do think ICN is a good long term hold. I'm going to be watching it closely however, I don't like their main portfolio very much.
In my opinion, SONM is the best current coin for you to buy and hold.
The current price is very low compared to the ICO price.
Some news says there will be a rise in the price of SONM in the near future.
Good luck!