How to determine cluster lifetimes in MATLAB?

I have a dataset on which on MATLAB I used linkage, via wards, to obtain a separation through hierarchical clustering. I want to separate those results such that the number of clusters is the one corresponding to the maximum lifetime, is that a way to do this without having to observe each dendrogram (I have hundreds of datasets to apply this method, so this approach would be very time consuming).

Thanks in advance