The table that summarizes the posterior distribution of model parameters will be updated whenever the elapsed time (in seconds) is a multiple of the value specified here. For example, if you specify "30" then the summary table will be updated every 30 seconds.
This setting affects the updating of the Bayesian SEM window, but not other windows. The posterior summaries for Additional Estimands can only be updated by clicking in the Additional Estimands window. The same goes for posterior summaries in the Custom Estimands window.