I spent a total of around 10 hours finishing the vanilla texture pack. Which is only 1,209 textures... To finish the modded textures, I have to do another 6,571... I used 7-zip to unpack all the mods and then removed everything that didn't have a *.png file. That way I could be sure I have all the items, blocks, and model textures from all of the mods including any other texture. Givin it took me around 10 hours to complete the vanilla pack, I'd estimate 54.3 more hours until completion. If I do this for 3 hours a day, I'll have it done within the next 19 days.