Two-day weddings change the math on everything, starting with how much stock actually needs to come along.
For a welcome dinner and a twelve-hour wedding day, that is usually six rolls between 16mm and Super 8, two camera bodies, and enough batteries for the digital second camera to run cold all day without a recharge window.
The part nobody warns you about is lab logistics — rolls shot on day one should ideally ship for processing before day two even starts, so nothing sits exposed longer than it has to.
None of this is glamorous. It is just the quiet infrastructure behind a film that looks effortless.