that's too bad, it seems to be based on eehack 4.7 which i know usually logs for hours with no problem? not sure what the bug would be.
if you can't make eehack work, another alternative is to log with tunerpro rt
then you can export your logs as CSV files and run them in trimalyzer for analysis
it's a bit harder to use than eehack but not much http://fbodytech.com/trimalyzer/