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The craft time is a simple feature in the game which implements timings for crafting items. It will take a certain amount of time to craft every items. For example, it takes 30 seconds to craft 10 Small Rocks.
You have an ability to walk, but not run, whilst crafting. However, crafting slows you down considerably. It's recommended to craft during the night, whilst secure ( if you are secure and have the option for this feature on.)