idle time

• downtimePeriod of non-operation
• waitingRemaining in expectation
• boredomWeary disinterest from monotony
• slackAbsence of tautness
• lullTemporary period of quiet

pause · twiddling thumbs · killing time · standby · limbo · dead time · loafing · dawdling · buffer · lag · hiatus · interlude · recess · stagnation · lounging · procrastination · fallow · hanging around

• delaysdelays, delay, delayed, postponement, postpone
• Idle Phrasesidle hands, twiddling thumbs, killing time, at rest, doing nothing
• spent timequality time, downtime, leisure, free time, break
• call centerscold call, inbound call, outbound, call volume, queue
• metricsKPI, metric, KPIs, metrics, statistics
• performance metricsmetrics, metric, KPIs, benchmark, benchmarks