This isn't an easy question to answer simply because it comes down to so many individual factors.
If your hay is very palatable, high in sugar, and your horse is an enthusiastic eater etc, then it will eat the hay faster. If it is cold, then horses will eat hay faster. For example when feeding out round bales to 4 of my horses that was quite palatable it would take them 10-14 days to eat through the round bale in Summer, but in cold weather in winter, then it would only take them 5-7 days. This is because fiber in the horses stomach warms them up, so they eat more and quicker.
Most customers tell us that their rate of consumption with round bales usually halves plus there is less wastage. So not only are you making your hay last longer, you are not having the wastage issues as well. So it doesn't take long for your hay net to pay for itself.
A recent testimonial from a very happy customer stated: 'By using a 3cm Round Bale hay net with our goats, alpaca and sheep, we have gone from using one round bale per week, to our round bale now lasting 5 to 6 weeks! These nets are fantastic! Tegan'
I have had a 3cm holed Large (full small bale) last 2 horses 4 days, but they were getting 2 other hay nets a day as well. All that is for certain is that by using a GutzBusta hay net, your horses and livestocks rate of consumption will certainly be a lot less as will the amount of hay wastage. Plus don't forget the many other health benefits.