Simply but slow access to run catalog using
lynx -dump url="http://online.star.bnl.gov/RunLog/Summary.php"

The folowing script daySummary.sh allows you to querry the Run Catalog for all files taken in a given day, select only those you need, and do some math with events, time, etc.
Example output for January 22:

rcas6010:~/0x>daySummary.sh 22
run=5022018   delTsec=1163 nMinB=989
run=5022048   delTsec=407 nMinB=22839
run=5022049   delTsec=225 nMinB=10284
run=5022051   delTsec=36 nMinB=1741
run=5022052   delTsec=345 nMinB=20166
run=5022055   delTsec=1396 nMinB=94371
DAY=022 selected 6 runs,  Total events=150390 ,  time=3572 seconds, 

Verify content of this script prior to use.
The example posted here selects runs from a single day with: id < 200, tpc in data stream, trigger productionMinBias / Physics and more then 10 events per run.
Your criteria may be different !

Good luck :)