time duration instead of second since client side is sending duration directly

[jshencode]

this is causing server side in non purge mode essentially forever when client side crashed

[codecov[bot]]

Codecov Report

Merging #298 into master will decrease coverage by 0.02%. The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #298      +/-   ##
==========================================
- Coverage   71.74%   71.71%   -0.03%     
==========================================
  Files         166      166              
  Lines       23120    23120              
==========================================
- Hits        16587    16581       -6     
- Misses       5240     5246       +6     
  Partials     1293     1293

Impacted Files	Coverage Δ
datanode/bootstrap/bootstrap_server.go	77.43% <0%> (ø)	:arrow_up:
controller/mutators/etcd/schema_mutator.go	61.84% <0%> (-1.74%)	:arrow_down:
memstore/cuckoo_index.go	90.26% <0%> (-1.01%)	:arrow_down:

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[jshencode]

coverage does not make any sense. does not add or remove and line