I have shot a few videos and photo shoots for BAT auctions. Bidders do love videos but you should keep them below 3 min. ,1.5 min if it is not edited. If you really feel you need more content, break it up int 2 or 3 short videos. Hand held videos especially vertical phone videos can quickly become nauseating and that is the opposite desired effect you want. If you want to do your own videos with a phone use a cheap stabilizer like a DJI osmo mobile, and always shoot landscape. Look at other videos on BAT for time, content and pacing.
@tigeravg's video was perfect.