And let's do the math...
Since we're talking "Time Lapse" that means pauses between pictures. Depending on the subject, this would traditionally be between 5-minutes and 30-minutes.
100,000 x 5 = 500,000/60 = 8,333 hours or 347 days or 0.95 years to shoot.
50,000 x 30 = 1,500,000/60 = 25,000 hours or 1,042 days or 2.85 years to shoot.
500,000 frames yields 4.6 hours of video.
1,500,000 frames yields almost 14 hours of video.
There are not many time lapse projects that will require this durability. When we shot the construction of a 50-story building at one frame every eight minutes, we intercut sections of other material, like actual construction taking place and edited the whole thing down to about 6 minutes of eye candy.
IMHO, 50,000 actuations should cover most situations....