Hi, it sounds like you might have something specific in mind, but I will do my best to provide an answer for you.
A sax player can add incredible tone to any band, and we can certainly provide an excellent sax player for your wedding. Many songs can be given extra soul and excitement through the use of a sax, but the duration that they play within a song, will depend on the nature of the song chosen. Often sax players take solos within the song, or add extra harmony to various sections.
The length of time you have a sax player at a wedding ultimately depends on how many songs the band has arranged for them to play in. Our sax player is used for probably 50% of our band songs. The songs they play can be spread throughout the night. Sax can inject incredible energy into a dance song, so they may be involved towards the dance section of the night in particular. Having said this there are some incredible sax parts in quieter songs such as Baker Street by Gerry Raffety, or Careless Whisper by George Michael. Great sax players can also perform by themselves, but this is not particularly common.
Perhaps if you could please describe how you envisage the sax player being used at the wedding, we can provide more specific advice. If it is for a specific song(s) that you want played we can certainly provide better advice.