lol the ones i used to get only lasted a few hours too...i was always amazed at how fast they ate them!!!
per nancy1999's recommendation i purchased the merrick brank bully sticks. my kids have had the merrick flossies but ate those pretty fast as well

well i LOVE the merrick bully sticks! they are a lot harder i think and they also come individually wrapped and vacuum sealed. they are a little pricy (the 6" one i bought was around $4) but they LAST forever!!! i got the bully sticks last saturday and my kids chew nonstop on them and i think the 6in one is still about 5in long!!!
and the smell is not that strong. i can only smell them when i pick them up and sniff them lol. some other brands i have tried before i could smell them across the room