Shredded Pork Tenderloin in the Crock Pot?

Hello All! I have a 1 1/2 pound pork tenderloin that I plan on shredding and soaking in yummy BBQ sauce. Also sauteing some onions to add to the mix. Then placing it in the crock pot and adding more BBQ sauce as needed. I've made this before but totally forgot how long to cook it for... Once it's shredded it doesn't take as long to cook. So the last time I expected about 2 to 3 hours and I believe it was done in 1 1/2 hours. I'm using a smaller crock pot so it won't take up much room so it should cook fast. If you have made something like this before, could you please advise me as to how long to cook it for. Thanks much!