How long should one "Round" last in character seconds in a P&P RPG?

I've currently written my rules to assume 3 seconds equals one "Round". Characters take one offensive action per round, move 2 spaces, and take a defensive "free action" too, such as Evade and Magic Evade, which are always "Free Actions".

Players and enemies roll Initiative to see who goes first. Whoever LOSES the roll must declare their actions first, but the person who WON the roll declares their action second, however, their actions "resolve" first. thus the higher initiative character "interrupts" the lower initiative character (s).

There is a "Haste" spell which can give you double movement and double actions per round for 60 rounds. There is also "Ambidextrous" which allows dual wielding as well as "triple shot" which allows firing three rounds as a single action from any gun weapon. If a character is both hasted and has appropriate feats, they can triple-shot with each hand while dual wielding Colt.45 pistols, and if Hasted, they can triple-shot twice per round per weapon. Characters receive a -5 point penalty to Evade and Magic Evade when wielding a ranged weapon at melee/point blank range.

What do you guys think of these basic rules regarding turn sequence?

How long should one "Round" last in character seconds in a P&P RPG?
Post Opinion