I was experimenting with the Aquila sets at about the time I made the commitment to tune down to A=415 and play exclusively without nails... I was also beginning my journey into vihuelas and baroque guitar (and all gut) at ridiculously low tensions. My strings these days really do last for ages... the tensions are low, they don't fray if you don't have nails, and I usually end up changing them out of boredom or curiosity rather than need.
Gut trebles are relatively
more fragile (especially for the very thin diameters on a long scale), and do need changing more frequently than nylgut or carbon trebles, but at low tension, they FAR out last "normal" CG strings... and the basses last for ages. (easily twice or three times as long as Savarez 540R's which used to last me 6-8 weeks or longer when I played 665mm CG at A=440 with nails) Nails and playing tension really determine their longevity.
Your mileage will obviously vary...