
Erik,
I just finished up my largest project to date. The backup .drp is 416MB. The project folder as a whole is 20TB. I don't know how many timelines I have, but there are 36 final videos (e.g. Master timelines).
The project certainly takes longer to load if I have multiple timelines open or if the system is being slow for some reason. I've never timed it, but it has taken several minutes before; probably not more than 5.
With only one timeline open (and keeping the media nicely tucked away in collapsed folders), the project opened in about 15 seconds.
~Luke