Just keep reminding yourself that you can get only about 1 hour of best quality video on a disc. More will make the already bad video look poorer. You can use double layer DVD and get a little less than 2 hours. If you have a blu ray burner, you can put more standard video on the disc but you need a blu ray player to play it. If you do not plan to use discs, consider memory stick, they are inexpensive and you can get them in larger sizes. I cannot remember the last time I burned a disc but I have put video on many memory sticks.
Also plan ahead, break up your project into sections with menus like by year, by type of activity (scuba, vacations)etc.
It seems like you have a major task ahead of you so taking so time to plan may save you time in the end.