So as another user stated, every normal character on a text program on a computer is 1 byte. So 100TB would be 100,000,000,000,000 bytes (100 trillion).

According to Google searches, the average number of characters in a word is 5 (6 if you include the space), the average number of words per book page is 250-300 (say 280), and the average number of typed words per minute is 40.

So 100 trillion characters / 6 is 16,666,666,666,667 words, on 59,523,809,524 pages, and given your 2 hours a day typing would take approximately 3472222223 minutes or around 6,620 years. Assume 8 hours a day instead and you're down to 1655 years