Unable to get Marsh Snail Shell recipe

[Moonrider]

Hey!
I've been wondering how long does it take for the recipe to respawn? I've been sitting here for about 30-40 minutes for it to appear/respawn, changing channels and stuff and it doesn't appear.

I went to get Horned Conch Shell and Girmy Clam recipes and got both of them in almost no time, this is the only one I'm missing.

[Dassler]

Just talk to the NPC from that Guild, he has a quest that will lead you to the shell