You can always re-do the process but if done correctly the first time you wont get much more if any. I am not sure what you mean buy a 5 hour bho extraction, you mean you evaporated the butane and it took 5 hours? I hope you were in a very well ventilated area, with no open flames or sparks of any kind. That is all that really matters, be safe, BHO and Ice o Lator are my favs for sure. I am with the belief if it doesn't bubble it ain't worth the trouble. I have only seen a good bubble come out of BHO and Ice Extraction.