Configure timer settings from system properties

whats the variable value of lTimerSettings ?

Timers are configured using an ISO 8601 time format. A timer definition must have exactly one of the following elements.

Possible values are ex: 2016-03-11T12:13:14 or 2016-03-11T12:13:14Z or 2016-03-11T12:13:14+01

Refer this docs page: Timer Events | docs.camunda.org