Just checking how quick you mix and master

I am a producer who makes beats for other artists and I want to give them a mixed and mastered song after they have recorded on the beat. I would just like to know how much you charge for both mixing and mastering as well as how long it would usually take you to finish mixing and mastering the track. Thank You

Additional info:
The song has less than 10 tracks recorded that need mixing. I'm interested in working with a very experienced mixer. I'll need you to master it too if possible. The tracks are cleaned, tuned, and and the song is ready to be mixed.