When sucking on a Jolly Rancher in your mouth it takes around 10 minutes to finish a Jolly Rancher.
The last time I timed the time it takes for me to dissolve and finish a Jolly Rancher in my mouth it took me 10 minutes from the time I put the Jolly Rancher in my mouth to the time it dissolved.
Your Saliva and the warmth of the inside of your mouth will dissolve the Jolly Rancher much faster than it would if you just dissolve the Jolly Rancher in a bowl or cup of water.
When I put a Jolly Rancher in a cup of water it took 20 minutes to dissolve the Jolly Rancher in the water while it only took 10 minutes to dissolve the Jolly Rancher in my mouth.
However if you chew on the Jolly Rancher and break the Jolly Rancher up then it takes only a few minutes to dissolve the Jolly Rancher in your mouth.
As it takes less time to dissolve a broken up Jolly Rancher than it does to dissolve a full Jolly Rancher.