Wind ensembles generally take less time than marching band does, and it’s a year-round activity.
At big universities, there may even be two levels of wind ensembles – a high-level one that you get in to by competitive audition and that performs in many concerts each year and travels, and a lower-level one that performs less frequently, rarely or never travels, and is open to any competent player. The latter requires a much smaller time commitment. .