Up to 3 months’ stay is allowed on a business visa for Spain.
The Spain Business visa is only valid for a limited period of time. A stay of “90 days in any 180-day period” is described as a “short stay.” This means that in any 180-day cycle, the total length of stay cannot exceed 90 days. You can only access the Schengen region once with a single-entry visa. During the validity of the Schengen Visa, a two-entry or multiple-entry visa allows for two or more entries