if i receive a non immigrant b multi entry visa for business purposes, does this give me the capacity to exit and enter Thailand numerous times each 90 day period without effecting the total visa 12 month period.For example, I am looking to exit Thailand a few days after first arrival on a new visa and return to Thailand 10 days or so later.

If I do exit after the first few days, am I then able to wait up to a maximum of 90 days before having to exit again?

You are free to come and go on a Multiple Entry Visa Non-Immigrant as often as you like, as long as the visa is valid.

On every arrival you will get a stamp allowing you to stay for 90 days counted from the day of arrival. You may leave the country in this period of time any time again and will receive 90 days again when you get back to Thailand but on the 90th day of a consecutive day you MUST leave the country to avoid overstaying by the law's definition.

Cheers,

Richard