For the 3750-12S
From
http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3750-x-series-switches/data_sheet_c78-584733.html
194,224 hours
For the GLC-T and MM
From http://www.staples.com/Cisco-GLC-T-1000BASE-T-SFP-Gigabit-Interface-Converter/product_IM1C01843
--Dave