How long does one opening act perform for?

Opening acts typically perform for around 30-45 minutes, but this can vary depending on the artist, the venue, and the overall structure of the show. Some opening acts may perform for a shorter or longer period of time, and in some cases, there may be multiple opening acts performing at the same show. The specific length of an opening act's performance is usually determined by the agreement between the opening act and the headlining artist, and the promoters of the show.