Is a 3 kilogram tent heavy?

I'm going on my Duke of Edinburgh in a couple of weeks and would like to buy a tent. I would also like one for general use. I've looked at some in the <�40 price range. I stumbled upon the Ryde 2 Man Dome Tent from Eurohike. Firstly, is this a decent tent? And also, it is 3kg. Will this be a major inconvenience when walking up to 30 kilometres? Any suggestions to other tents?