Change configuration format for duration (#263)

[0xERR0R]

closes #263

[codecov]

Codecov Report

Merging #277 (62f6a78) into development (ee8f041) will increase coverage by 0.21%.
The diff coverage is 92.00%.

@@               Coverage Diff               @@
##           development     #277      +/-   ##
===============================================
+ Coverage        95.63%   95.84%   +0.21%     
===============================================
  Files               31       31              
  Lines             2152     2166      +14     
===============================================
+ Hits              2058     2076      +18     
+ Misses              65       63       -2     
+ Partials            29       27       -2     

Impacted Files	Coverage Δ
config/config.go	93.27% <86.66%> (+4.70%)	⬆️
lists/list_cache.go	98.33% <100.00%> (ø)
resolver/blocking_resolver.go	100.00% <100.00%> (ø)
resolver/caching_resolver.go	100.00% <100.00%> (ø)

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