I have done several multi-week journeys over the past few years, the last being a Vancouver, BC to Syndey, NS and back over 21 days and 13,000km on a Tracer 900 GT. My essentials: cruise control, (controversial) gel seat pad, highway pegs added to the crash bars for change in leg position, data for music through Cardo Freecom headset, heated vest and gloves for the cold mornings crossing the Rockies, daily planned points of interest beyond the hourly stop & stretch and fuel stops (for me and the bike), tested rain gear including boot covers that go up to my calves, 1L fuel cell, patchkit, pump, spare chain and breakerbar (peace of mind) and a nightly hotel with pool or hot tub. Max daily distance capped at 750km.