I want to record a time-lapse video of a christmas tree being put up in the lobby of a Walt Disney World hotel. The amount of time that it takes the crew to put up the tree is about 6.5 to 7 hours. I'm going to shoot this with a Nikon D750 and use the time-lapse movie mode. It has a built-in intervalometer but I prefer to let the camera do all the work. I know how to use the feature and I know how to set the exposure I will need but what I'm not so sure of is how often I should have the camera take a picture. If any of you who have experience with time-lapses have any suggestions, I would greatly appreciate it. Here's a video I shot last year to give you an idea of what I'm looking to do again this year. This is just a regular video sped up but I would prefer not to do that again this time around. Thanks!