It still has 62 bits of randomness; you have 4,611,686,018,427,387,904 values every millisecond. I would judge the chances similar to UUIDv4: theoretically pos

It still has 62 bits of randomness; you have 4,611,686,018,427,387,904 values every millisecond. I would judge the chances similar to UUIDv4: theoretically possible, but the chance is so small it's practically impossible.