7250 GC/Q-TOF vacuum level needed to start Bakeout

The instrument was vented for 3 days.  It has been pumping down for 6 hours and the TOF Vac is 4e-6 Torr.  I believe I should be around 6e-7 when fulling under vacuum.  What does the vacuum need to be before starting the backout?  The Rouch Vac and Quad Vac are already at the expected values.  Thanks

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