How many origins of replication on the chromosomes of eukaryotes are there?

Up to 100000 in a single human cell

Not too many people know that eukaryotes often have multiple origins of replication on each linear chromosome that initiate at different times (replication timing).  It is interesting to know that there may be up to 100,000 replications present in a single human cell.   Having many origins of replication has so many advantages.  For instance, this helps to speed the duplication of their much larger store of genetic material. Keep in mind that the segment of DNA that is copied starting from each unique replication origin is called a replicon.