The honest answer to that would be "the correct amount of time", but that's not really all that helpful. It's impossible for any of us to sit here and give you times for woodworking, factors that would influence the time spend would include: area of wood, hardness of wood, moisture content of the wood, moisture content of the air, strength of your arms, size of your hands, number of tea breaks, frequency/prettiness of passing girls etc. etc. If you could answer all those questions (and probably quite a few more) then one of our resident scientists would probably be able to give you a working answer, in all honesty though I would expect that a much quicker way to get an answer would be to have a glance at the clock and then just crack on with it. It's an art mate, not a science