Seems like the prestart script is always waited upon to finish:
Our prestart script runs a batch file to do some confic syncing, env setup etc. The job had a 4min startup timeout
2014-09-15 21:57:50: 0: INFO: Executing job preload script C:\Users\scanlinevfx\AppData\Local\Thinkbox\Deadline6\slave\LAPRO0646\plugins\5417c2f002949845000425aa\JobPreLoad.py
…
2014-09-15 21:57:53: 0: INFO: Scanline 3ds Max config file: \s2.scanlinevfxla.com\exchange\software\managed\SoftwareConfiguration\Max2012\ConfigurationSettings\Default_Prestart_Max2012_64Bit_Farm.bat
2014-09-15 22:01:51: 0: Start job timed out – canceling current task…
…
then ultimately killed 11 mins later:
2014-09-15 22:13:20: 0: INFO: Output (log-dump, ignore the deadline timestamps):
cheers
laszlo