int main() {
   const uint64_t minRange = 0x100000000;
   const uint64_t maxRange = 0x1ffffffff;
   const uint64_t magic_number = 0x1a96ca8d8 - minRange;
   uint64_t max = maxRange - minRange + 1;      // range size
   uint64_t speed;
   uint64_t count = 0;

   struct timespec start, ticks;
   clock_gettime(CLOCK_MONOTONIC, &start);

   while (max--) {
        if (count == magic_number) {
            printf("Generated number: %16llx\n", count + minRange);
//            break;
        }

        ++count;
    }

    clock_gettime(CLOCK_MONOTONIC, &ticks);
    uint64_t ns = (ticks.tv_sec - start.tv_sec) * 1000000000ULL + ticks.tv_nsec - start.tv_nsec;
    // avoid 64-bit overflow
    speed = count * 1000000ULL / (ns / 1000);
    printf("Ops: %llu speed: %llu ops/s\n", count, speed);

    return 0;
}

Generated number:        1a96ca8d8
Ops: 4294967296 speed: 3099732241 ops/s