give resolution time in minutes for the given user story, only provide the number of minutes in the output without any other text

User story: To make docker images, fabric-test uses "make docker" in fabric-ca. But, it makes fabric-ca, fabric-ca-orderer, fabric-ca-peer, and fabric-ca-tools docker image.  I think it is better to change a target to docker-fabric-ca in "make docker-images" for reducing test time. This target only makes fabric-ca docker image.     {code:java}  vagrant@ubuntu-xenial:/opt/gopath/src/github.com/hyperledger/fabric-test$ docker images  REPOSITORY                      TAG                             IMAGE ID            CREATED             SIZE  hyperledger/fabric-ca-fvt       latest                          fff85beefde8        28 seconds ago      2.13GB  hyperledger/fabric-ca-fvt       x86_64-1.2.0-snapshot-06a411f   fff85beefde8        28 seconds ago      2.13GB  hyperledger/fabric-ca-tools     latest                          2f4b5c5bc95f        2 minutes ago       1.55GB  hyperledger/fabric-ca-tools     x86_64-1.2.0-snapshot-06a411f   2f4b5c5bc95f        2 minutes ago       1.55GB  hyperledger/fabric-ca-peer      latest                          4d339a9c0684        3 minutes ago       278MB  hyperledger/fabric-ca-peer      x86_64-1.2.0-snapshot-06a411f   4d339a9c0684        3 minutes ago       278MB  hyperledger/fabric-ca-orderer   latest                          940c4d1828ed        3 minutes ago       272MB  hyperledger/fabric-ca-orderer   x86_64-1.2.0-snapshot-06a411f   940c4d1828ed        3 minutes ago       272MB  hyperledger/fabric-ca           latest                          cbf0c1eb861c        3 minutes ago       299MB  hyperledger/fabric-ca           x86_64-1.2.0-snapshot-06a411f   cbf0c1eb861c        3 minutes ago       299MB  hyperledger/fabric-tools        latest                          13536a20f50a        9 minutes ago       1.48GB  hyperledger/fabric-tools        x86_64-1.2.0-snapshot-968d12b   13536a20f50a        9 minutes ago       1.48GB  hyperledger/fabric-tools        x86_64-latest                   13536a20f50a        9 minutes ago       1.48GB  <none>                          <none>                          f7c60f72b2ba        9 minutes ago       1.66GB  hyperledger/fabric-testenv      latest                          e49faba66f23        10 minutes ago      1.57GB  hyperledger/fabric-testenv      x86_64-1.2.0-snapshot-968d12b   e49faba66f23        10 minutes ago      1.57GB  hyperledger/fabric-testenv      x86_64-latest                   e49faba66f23        10 minutes ago      1.57GB  hyperledger/fabric-buildenv     latest                          2e5ae9a22cb3        10 minutes ago      1.49GB  hyperledger/fabric-buildenv     x86_64-1.2.0-snapshot-968d12b   2e5ae9a22cb3        10 minutes ago      1.49GB  hyperledger/fabric-buildenv     x86_64-latest                   2e5ae9a22cb3        10 minutes ago      1.49GB  hyperledger/fabric-ccenv        latest                          cf2e290ccdb0        11 minutes ago      1.44GB  hyperledger/fabric-ccenv        x86_64-1.2.0-snapshot-968d12b   cf2e290ccdb0        11 minutes ago      1.44GB  hyperledger/fabric-ccenv        x86_64-latest                   cf2e290ccdb0        11 minutes ago      1.44GB  hyperledger/fabric-orderer      latest                          717adbca7010        12 minutes ago      171MB  hyperledger/fabric-orderer      x86_64-1.2.0-snapshot-968d12b   717adbca7010        12 minutes ago      171MB  hyperledger/fabric-orderer      x86_64-latest                   717adbca7010        12 minutes ago      171MB  hyperledger/fabric-peer         latest                          4cba91debd8c        12 minutes ago      175MB  hyperledger/fabric-peer         x86_64-1.2.0-snapshot-968d12b   4cba91debd8c        12 minutes ago      175MB  hyperledger/fabric-peer         x86_64-latest                   4cba91debd8c        12 minutes ago      175MB  hyperledger/fabric-baseimage    x86_64-0.4.7                    390ac2e95bc7        2 weeks ago         1.41GB  hyperledger/fabric-zookeeper    latest                          1ce465be7112        2 weeks ago         1.39GB  hyperledger/fabric-zookeeper    x86_64-0.4.7                    1ce465be7112        2 weeks ago         1.39GB  hyperledger/fabric-kafka        latest                          4fed436fc0a0        2 weeks ago         1.4GB  hyperledger/fabric-kafka        x86_64-0.4.7                    4fed436fc0a0        2 weeks ago         1.4GB  hyperledger/fabric-couchdb      latest                          35228d48a25a        2 weeks ago         1.56GB  hyperledger/fabric-couchdb      x86_64-0.4.7                    35228d48a25a        2 weeks ago         1.56GB  hyperledger/fabric-baseos       x86_64-0.4.7                    c0e784934c4e        2 weeks ago         152MB  hyperledger/fabric-tools        x86_64-1.1.0                    b7bfddf508bc        3 weeks ago         1.46GB  hyperledger/fabric-orderer      x86_64-1.1.0                    ce0c810df36a        3 weeks ago         180MB  hyperledger/fabric-peer         x86_64-1.1.0                    b023f9be0771        3 weeks ago         187MB  hyperledger/fabric-baseimage    x86_64-0.4.6                    dbe6787b5747        7 weeks ago         1.37GB  hyperledger/fabric-baseos       x86_64-0.4.6                    220e5cf3fb7f        7 weeks ago         151MB  {code}
Answer: 18736.0