Can I mix leftover dye with conditioner so my coloured hair takes longer to fade?

Hi, I just dyed my hair using Arctic Fox Purple Rain and after googling this, most of the results were for hair masks using deep conditioner, which I'm guessing you're not really supposed to use regularly but just when you need a touch up.

Is that the best option? Or can I just mix some of the dye with my regular conditioner and use that every time I wash my hair? Would that be a good idea? And if so, how much dye should I be adding?

Thank you and have a nice day!