Well, I could give two answers to that question.
(1) None. If by practical you mean, broadly - how will the results of contemporary philosophical research benefit me, or society at large. Philosophy is not like, for instance, the medical sciences in that generations of progress in medical research has enabled us to live lives that are freer of ailment and disease than those of our predecessors. I suppose it is of some practical benefit to those of us who make a living out of it, but the world certainly isn't going to come to a stand still if all the philosophers stay home and play DOOM instead - the biomedical, and other, sciences would continue to advance just as the have done, with all the benefits that such advancement brings. So, in terms of improving the lives of we humans, philosophy is pretty useless. One caveat to that, I guess, is that logic, formal languages, and - as such - computer science, has its origins in philosophy (esp. Frege), but that was a while ago now!
(2) Some. If by practical you mean, 'can philosophy or philosophical thinking be useful to other things, rather than merely an end in itself', then yes, I think. As I indicated earlier, if we're understand the significance of certain claims made in other disciplines, that uncritically invoke everyday notions like, 'object', 'property', 'event', 'part/whole', as (I presume) occurs in the sciences, or perhaps 'meaning', 'truth', 'understanding', as occurs in linguistics, or 'mind', 'belief', 'desire', 'intend', 'perceive', 'represent', as occurs in psychology, then it's useful to have reflected on the significance of these notions, and on the nature the things that they putatively denote. But - as far as I know - there's no experiment that will tell you what an object is, or what a property is, or what it is for one thing to be a part of another, or what the relationship is between an object and its properties. So, philosophy is useful if we want to better understand the broader import of claims that are made in other disciplines - disciplines that, presumably, are of some practical benefit - that make use of some very abstract, but still everyday, notions.
But, personally, I'm happy enough with (1). I think that many things are interesting, and - as such - worth reflecting on, even if doing so is of no practical benefit to the world at large.