Timer Services 
chainTimerService 
The chainTimerService is based on block times with units of 1 second.
The timer service lets you:
- Schedule wake()calls.
- Remove scheduled wake()calls.
- Create a repeater for scheduling of events at regular intervals.
For testing, use
js
import buildManualTimer from '@agoric/zoe/tools/manualTimer.js';See package @agoric/time for details.