Mody, you have asked an interesting question. There will be a hundred different answers! If I might pre-maturely summarize what most people will probably say, it depends on three things:
The type of plane you are flying, the style of flying you are doing, and the conditions you are flying in.
example:
If you are flying an underpowered plane or a small EDF, or flying into heavy winds, you are probably full throttle most of the time.

If you are flying a .60 sized Corsair with a .60 sized two stroke glow engine, you are probably 1/2 throttle or more most of the time.

If flying something more relaxing like a Cub, probably 1/4 to 1/2 throttle most of the time unless you are flying in heavy wind or you are testing its aerobatic limits. In calm winds, my 1/4 scale cub will fly 6" off the ground forever at 1/4 throttle or less and I enjoy doing this quite a bit. But If I am flying in 20mph winds (which I do quite often) it takes full throttle to keep the plane moving at any ground speed .

When flying my sport planes or practicing aerobatics, the throttle is all over the place during different manuevers. I.e. full throttle during the up leg of a loop, then cut to 1/4 on the down side. etc,

So you see, there is no definite answer. Just remember that there is more to a throttle than idle or wide open, there is a lot of fun to be missed in between.