Long-distance gravel events are made for adventurers. It's less about speed and more about endurance, navigation and stamina - and efficiency for those at the top. Smart pauses can mean stopping only when several things can be done at once, such as taking off your jacket, peeing and topping up your water.
These events are often organised without support (unsupported), which means that you are on your own and have to carry your own equipment and food or organise it on the way. You also have to organise your own accommodation.
You can sleep in hotels, but do not book them before the start. The routes often lead through remote regions and require good planning as well as mental and physical strength. The clock only stops at the finish.
A bikepacking event usually starts the day before with a briefing. The organisers explain the rules, warn of dangerous sections, point out long routes without refreshment facilities and provide information about what else is important. Personal preparation starts beforehand, however, and packing is part of it. Also: study the route, check catering options, accommodation options and more. Many experienced bikepackers prepare a road book, print it out and laminate it to make it weatherproof. Others use their smartphone or the event track on their sat nav.
At most events, each participant is given a GPS tracker so that the bikers can be tracked online at all times - this is called "dotwatching". The clock starts ticking at the start, no outside support or help is allowed, not even private overnight accommodation. You can go to supermarkets, petrol stations, restaurants, sleep on campsites, in hotels along the route or not at all. The rules - and also legal regulations, for example on wild camping - can differ from event to event, so you should read them carefully beforehand.

Editor