Changing SG300 from Layer 3 to Layer 2

Will changing an SG300 switch from Layer 3 to Layer 2 cause any significant user downtime, or any at all?  I have two 52-port SG300's and two 20-port SG300's to make this change to.

From the admin guide p.254:
http://www.cisco.com/en/US/docs/switches/lan/csbms/sf30x_sg30x/administration_guide/78-19308-01.pdf
NOTE Switching from one system mode (layer) to another (on Sx500 devices) requires a
mandatory reboot, and the startup configuration of the device is then deleted.
So, you will want to backup you config, do this in a scheduled maintenance interval and reload the config by hand.
Also realize there may be L3 commands in your config that will not apply in L2 mode.
Good luck!

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