Temporary Import Permit for Chile

[gpeacock]

Hi there
We are heading south to Chile, arriving in April 2018 with a planned stop at Easter Island in March. We hope to leave the boat in Puerto Montt or Valdivia for the Chilean winter and then cruise the northern canals for the summer season. We then hope to repeat the process the following year.
For tourists, the rules seem simple. Boats... not so much.
I've found limited info on Temporary Import permits but non of it is official and it seems to range from 90 days to 2 years. Can anyone point me to something official?
Would the arrival at Easter island start the clock?
Does putting the boat on the hard stop the clock?
Chile is a big cruising ground, its a pain to get to and we dont want to rush it.
Thanks for any info...
Gary