int64_t Creature::getStepDuration() const
{
	if (isRemoved()) {
		return 0;
	}

	uint32_t calculatedStepSpeed;
	uint32_t groundSpeed;

	int32_t stepSpeed = getStepSpeed();
	if (stepSpeed > -Creature::speedB) {
		calculatedStepSpeed = floor((Creature::speedA * log((stepSpeed / 2) + Creature::speedB) + Creature::speedC) + 0.5);
		if (calculatedStepSpeed <= 0) {
			calculatedStepSpeed = 1;
		}
	} else {
		calculatedStepSpeed = 1;
	}

	Item* ground = _tile->getGround();
	if (ground) {
		groundSpeed = Item::items[ground->getID()].speed;
		if (groundSpeed == 0) {
			groundSpeed = 150;
		}
	} else {
		groundSpeed = 150;
	}

	double duration = std::floor(1000 * groundSpeed / calculatedStepSpeed);
	int64_t stepDuration = std::ceil(duration / 50) * 50;

	const Monster* monster = getMonster();
	if (monster && monster->isTargetNearby() && !monster->isFleeing() && !monster->getMaster()) {
		stepDuration *= 2;
	}

	return stepDuration;
}