Import keeps getting killed

I’m trying to import data from GA using the GA plugin, but the process keeps getting killed, but the error isn’t very clear as to why, other than the general “your host probably does not like running long PHP processes”. Is there any way to get a more detailed error or get around this? I’ve already imported some data into the site so do not want to use the command line if I can avoid it as this will mean a new siteID.