Is the first dance usually the whole song?

It is very common to shorten the first dance. Full songs often run 4 minutes or more, which can feel long for you and for your guests. Most couples choose to play an edited version, either by fading out around the 2 to 3 minute mark or by cutting to a chorus and ending. Your DJ or band can do this easily, just let them know in advance. Another popular option is to dance alone for the first minute or so, then signal for guests to join you on the floor. This turns the first dance into the start of the party, and everyone feels included. Some couples also plan a surprise transition, where the slow song suddenly changes to an upbeat track and the bridal party joins in. That is a fun way to keep the energy high. If you do want to play the whole song, that is fine too, especially if it is short or very meaningful. Just make sure you both feel comfortable and that your guests are not left standing awkwardly. A little planning goes a long way.