I believe for every 8 NEO you hold, you will get 1 GAS every 12 months, you can go here and it will tell you https://neotogas.com/ It will only register for 1 NEO or more, but I have less than 1 NEO on Kucoin and I still received GAS this month. So it will be a percentage. Theres an equation that factors in how much you hold, times how long you held it, divided by the total holdings...something like that. I think you can search for it in Binance support and it will explain it for you