Staff get a H gift for their long years of service. I don't know at what milestone it starts. One of my SAs have been with Hermes for like 12-15 years, and she got a Cape Cod watch in one of the years.
Also, there is other incentives for staff too. That is, a freebie a year. They get to choose a scarf or silver jewellery (amongst what others, I am not sure). You will see them wearing it as part of their uniform. But they can only really keep it if they are still a H staff 2 years from the very day they received the item from their manager.
Training .... H send SAs to offsite training locations. This is usually done regionally. In Asia, the most recent one was held in Bangkok, Thailand.