It looks like the Import Blogger plugin for WordPress is limited to 25 entries, then the plugin stops until you refresh the page (I clicked on Import, Blogger, then continue). I changed this default in the plugin by going to edit plugin and then selecting Import Blogger. In the header of the code, I changed the following to the values shown:
const MAX_RESULTS = 100;
const MAX_EXECUTION_TIME = 120;
The values were 25 and 20
This allowed for the plugin to pull in 100 entries at a time, much faster than 25.
You can experment with larger values, but for me this worked.