I have used hundreds and hundreds over the years and I have had one that was in a giant oak snap after being in the tree for about 8 years, never had any other problems. It is hard to say, could of happened after two days, was it a fluke? No clue, still using trees with steps that have been in 15 or more years and some are just a stub about 3"s sticking out. I now use sky-hook lags and hang on steps. I take them out and re-screw back in every 2 years as I would not be able to get them out if left in longer than that. It is up to you in the end and do what makes you feel safe. Shawn