Add timeout to CircleCI build for Xcode

I can't quite seem to get my circle.yml file in order to extend the timeout for my iOS tests. I've basically followed their example and things run, but because my tests are slow, it never completes and times out at the 600s mark (default). I need to add the timeout modifer (somewhere) to get this to run to completion. Can someone point me to where the timeout modifier should go to allow this to run longer than 5 minutes.

circle.yml

machine:
  timezone:
    America/Chicago
  xcode:
    version: 8.3

dependencies:
  pre:
    - xcrun instruments -w "iPad Air 2" || true

test:
  override:
    - set -o pipefail &&
      xcodebuild
        CODE_SIGNING_REQUIRED=NO
        CODE_SIGNING_IDENTITY=
        PROVISIONING_PROFILE=
        GCC_INSTRUMENT_PROGRAM_FLOW_ARCS=YES
        GCC_GENERATE_TEST_COVERAGE_FILES=YES
        -sdk iphonesimulator
        -destination 'platform=iOS Simulator,name=iPad Air 2'
        -workspace Augusta.xcworkspace
        -scheme "Augusta"
        clean build test |
      tee $CIRCLE_ARTIFACTS/xcode_raw.log |
      xcpretty --color --report junit --output $CIRCLE_TEST_REPORTS/xcode/results.xml
    - bash <(curl -s https://codecov.io/bash)