fix(gemini-1tb-10h): tune test_duration to meaningfull value
fix(gemini-1tb-10h): tune test_duration to meaningfull value

scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-longevity-tests