Sorry you are going through this. I don't actually know how long but it should be at least 1 year. I suppose it depends on who you have serving you and their opinion on 'wear and tear' vs warranty. I have a Gucci marmont I bought in 2016 at Heathrow. It had an issue around a year later, and we literally happened to be in a Gucci store in Italy when the bag's edge coating cracked off the top and it clearly had to go to repair, or it would literally fall apart. They did it without question and without charge, and sent it back to my local store (I was so annoyed at the time in Italy, I then got a bag from Ferragamo next - which I had to send in 3 times to Ferragamo as the clasp kept falling off before they finally replaced it - what poor luck!)
The Gucci bag has been fine since then, but with age the the leather handle and strap had began to crack and it was my daily bag for a long time, I did not baby it. I took it to my local store last year, it was chargeable, but they sent it to Italy, changed the top handle, strap, hardware, decorative bow and re-finished the edge coating again. It cost me about USD 450. My SA told me as long as they have the leather and hardware (it is discontinued), they will do the repair and, apart from some corner wear, it looks as good as new.