The time needed for rehdyrating depends on a couple things:
Size of food - the smaller you go, the less the time. Diced items will come back the fastest.
Altitude - this plays big when using heat to bring items back. For every couple thousand feet gain you will notice a lag in time needed. When above 10 or 11K, do plan in extra sit time.
Powdered items come back to life nearly instantly, though altitude and water at just above freezing can make an item take longer.
As for storage of dried items, when one is storing the components such as dried cooked beans, pasta, rice and vegetables you don't need to use a freezer. Tightly sealed they can be stored for a year with no issues in your cupboards. Just keep in a cool place out of direct sunlight for best results.
When dealing with dried items containing animal products, dairy, meat or fat the freezer is your best choice for storing in after drying. These items run a higher risk of spoiling on the shelf - especially with fat, it goes rancid.