True that India will first have to send a man to space, and maybe a few more, before attempting a moon landing. However, if we devote our energy to it, I don't think it should take quarter of a century, because many technologies have advanced since USA did it. For instance, the mission computer was about as big as a room (and that was a big technological challenge at the time, to fit a computer into such a "small" volume), and had 64 kilobytes of memory! Today the computational power available to us is billions of times higher, and can fit into the palm of a hand. Material sciences have also advanced significantly. Whether India has the required expertise in aerospace, I don't know.
Another question is whether we should devote our national energy to such an endeavor at this stage. The US did it on a war footing, and took them ten years in the 60s. We could possibly do it in 15 years if we devote all our energy into it - but can we afford to do that? We are no superpower, and have other national priorities. So all that considered, 25 years might be a better timeline.
if Jan 5 succeeds. 
...u fix urzz 
