How do you acclimate Saltwater Nerite Snails to fresh water?

Chance it's Nerita tessellata?
It's a commonly sold marine species that does look checkered.
 
I talked to a sw snail breeder about ordering some nerites and he said it only takes about an hour to acclimate them. Makes sense to me since they can crawl between intertidal zones pretty frequently. He could have been just been blowing smoke in an attempt to sell me some nerites. But I dont think it takes as long to acclimate a snail vs. a fish.

This was for olive nerites btw. Sorry for any confusion.

On another note I read somewhere or other a while back that there are naturally occurring olive nerites that breed in fresh water that some how ended up getting landlocked.
 
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