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Hi Jon,
RGB exposures are usually about three times longer since the spectral banspass is one-third of the Lum. However you can play with this alot and still be ok. (I use equal exposure lengths for L and RGB since calibration is way more convenient! Plus my standard sub length for L is 30 min...)
To be exact it's a lot more complicated since the QE of the chip varies and the sky background brightness also varies across the different wavelengths. And even more complicated the sky background can change for different locations (light pollution type) and times of year (airglow variations).
Best,
EB
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