Wizard of Draws wrote:

How much separation is required by the tower for a/c taking off and landing?

3000 feet between singles. A single behind a twin is 4500. A twin
between a single is 4500. If anything is over 12,500 in weight then
it's 6000 feet. For landing it's the same as takeoff except that when
anything above 12,500 is involved then that aircraft can only be on the
runway by himself.



I was in position and holding on 34 at Asheville, NC (AVL) today, with a
plane on final, me in position and holding, and a 182 in front of me taking
off. Before his wheels left the runway, I was cleared for take-off.

The rule is you cannot start your takeoff roll until the required
separation exists. He probably hurried your clearance because of the
plane on final. Having one single chase another down the runway is
common at any busy GA airport. Being 500-700 feet short on separation
is a trivial matter.