how to delay sync by a set time, hour or day?

i want to setup a standby slave that listens 24/7 but only syncs when told to.

setting "pause_at_recovery_target (boolean)" in recovery.conf on slave
doesn't help since docs say it only "specifies whether recovery should
pause when the recovery target is reached."

also "recovery_target = 'immediate'" is the only value allowed.

i want to delay sync by a set time, hour or day.

how?

http://www.postgresql.org/docs/9.3/static/recovery-target-settings.html

thks, jzs