Celticmass is really new. So, I'm going to say that that info probably isn't available. I'm not so sure about Celtitren either. I want to say that IBE had something on Trenavar that was posted in the past, but I'm not 100%.
However, I'm pretty sure that SD had a half-life around 8-9 hours. And a few other PH's I've heard of having half-lives in that same 4-8 hour range. Which is why it's a good rule of thumb to take any PH in split dosages.