How much experience is needed to work in the customer service/ hospitality field?

It depends with the job to be performed and type of clientele that the particular firm serves.

Ideally Management positions require more experience and that is determined by the hiring manager and entry level jobs such as service jobs may require little or no experience provided one meets the basics of requirements such as communication skills, fine motor skills and so on.

All this differs from company to company and the best way to find out is to sift through job adds, apply and show up for interviews.

Good Luck.