script timing out

[mrmigu]

Hi
Im running a php script on apache on an xp box which downloads some files and then parses those files and put the info into a mysql database. These files are fairly large, and consist of 10s if not 100s of thousands of db entries, so its taking a while to input them into the db. Ive set my timeout values in the php.ini to an hour, but after about 20 minutes, the script just stops running. Its not like its timing out, because there is no error message.
Does anyone have any suggestions as to why it would be doing this?

Thanks