Kotlin ==========================================================

fun flipBit(): Long {
    val start = System.currentTimeMillis()
    var bit = false
    for (i in 1..100000000) {
        if (i % 7 == 0) {
            bit = !bit
        }
    }

    val end = System.currentTimeMillis()
    println("runtime: ${end - start} millis")

    return end - start
}

fun main() {
    var duration = 0L
    for (i in 0..9) {
        duration += flipBit()
    }
    println("avg: ${duration / 10} millis")
}

output ==========================================================

runtime: 917 millis
runtime: 672 millis
runtime: 368 millis
runtime: 311 millis
runtime: 268 millis
runtime: 472 millis
runtime: 474 millis
runtime: 493 millis
runtime: 468 millis
runtime: 513 millis
avg: 495 millis


python ==========================================================

import time


def flip_bit():
    start = time.time()
    bit = False
    for i in range(0, 100000000):
        if i % 7 == 0:
            bit = not bit

    duration = (time.time() - start) * 1000

    print('runtime: {} millis'.format(duration))
    return duration


if __name__ == '__main__':

    duration = 0
    for i in range(0, 10):
        duration += flip_bit()
    print('avg: {} millis'.format(duration / 10.0))


output: ==========================================================
runtime: 7595.5350399 millis
runtime: 6216.00914001 millis
runtime: 6293.36380959 millis
runtime: 6323.05788994 millis
runtime: 6166.88799858 millis
runtime: 6446.27094269 millis
runtime: 6254.33778763 millis
runtime: 6484.94696617 millis
runtime: 5926.96404457 millis
runtime: 5895.44296265 millis
avg: 6360.28165817 millis