-exec 3> apt-progress.log
-testsuccess --nomsg apthelper download-file "http://localhost:${APTHTTPPORT}/$TESTFILE" ./downloaded/http-$TESTFILE $OPT -o Acquire::http::Dl-Limit=600
-assertprogress apt-progress.log
+for i in 2 5 7 10 12 15; do
+ exec 3> apt-progress-http.log
+ testsuccess --nomsg apthelper download-file "http://localhost:${APTHTTPPORT}/$TESTFILE" ./downloaded/http-$TESTFILE $OPT -o Acquire::http::Dl-Limit=$((1600/i))
+ if [ "$(wc -l apt-progress-http.log | awk '{print $1}')" -ge 3 ]; then
+ break
+ fi
+done
+assertprogress apt-progress-http.log