When will my SLURM job start?

The SLURM squeue command with the options - -start and -j provides an estimate for the job start time, for example:

$ squeue --start -j <jobid>

JOBID   PARTITION    NAME     USER ST          START_TIME  NODES SCHEDNODES           NODELIST(REASON)
439148   compute    LSea1  u123456 PD 2015-10-15T16:36:49     80 m[10020-10027,10029, (Resources)

How to use environment modules in batch scripts   Why does my job wait so long before being executed? or: Why is my job being overtaken by other jobs in the queue?