I have never put it on a scale but I guess it is between 1400gm and 2000gm
you need special tools to set the cranks at the right torque, and also to set the bearing caps at the righ torque + special sockets to set the crank bolts, and other stuffs.
for maintenance you just have to add some special grease in the hub once or twice a year, and to check that the shifting buttons and the cranks are still tight.
Before buying mine (which was a second hand), I read all this long thread
You 'll learn a lot if you read it.