Use a duration string instead of int to represent duration

[jessesuen]

No description provided.

[codecov]

Codecov Report

Merging #286 into master will decrease coverage by 0.09%.
The diff coverage is 76.92%.

@@            Coverage Diff            @@
##           master     #286     +/-   ##
=========================================
- Coverage   83.86%   83.76%   -0.1%     
=========================================
  Files          63       63             
  Lines        5645     5661     +16     
=========================================
+ Hits         4734     4742      +8     
- Misses        666      671      +5     
- Partials      245      248      +3

Impacted Files	Coverage Δ
experiments/experiment.go	93.3% <100%> (ø)	⬆️
...kubectl-argo-rollouts/cmd/list/list_experiments.go	93.54% <100%> (+0.1%)	⬆️
utils/analysis/factory.go	100% <100%> (ø)	⬆️
utils/experiment/experiment.go	92.23% <60%> (-1.77%)	⬇️
analysis/analysis.go	82.65% <69.56%> (-1.7%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ea957a1...c83e2b4. Read the comment docs.

[dthomson25]

LGTM

[dthomson25]

I don't think it matters, but this was previous 1 hour not 3