The length of time it takes for paper to dissolve in water is between a few minutes to a few hours depending on the paper.
However not all kinds of paper will dissolve in water.
The kind of paper that will dissolve in water is SmartSolve water soluble paper which is a bio based material made from Forest Steward Council sourced wood pulp fibers and a natural cellulose ingredient.
When the material comes into contact with water then the cellulose ingredient dissolves and then the wood pulp fibers separate and remain.
Paper is made of cellulose. Cellulose is insoluble in water.
Some tissue tissue papers disintegrate quickly in water.
But it does not dissolve fully.
Water soluble paper manufacture method adopts slurrying, hanging, vacuum dehydration, oven dry, calendaring technology.
The first step: net making paper, (1.5D * 4mm) slurrying becomes thin water-solubility vinylon fiber Fiber, wet papermaking becomes net, and through vacuum dehydration, oven dry makes.
Commercial paper is quite durable and often needs a muriatic acid, also known as hydrochloric acid, to completely disintegrate.