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We present and analyse quasi-simultaneous multi-epoch spectral energydistributions (SEDs) of seven reverberation-mapped AGNs for which accurateblack hole mass measurements and suitable archival data are available from the'AGN Watch' monitoring programs. We explore the potential of optical-UV andX-ray data, obtained within 2 days, to provide more accurate SED-basedmeasurements of individual AGN and quantify the impact of source variability onkey measurements typically used to characterise the black hole accretionprocess plus on bolometric correction factors at 5100 {\AA}, 1350 {\AA} and forthe 2-10 keV X-ray band, respectively. The largest SED changes occur on longtimescales (>1 year). For our small sample, the 1 micron to 10 keV integratedaccretion luminosity typically changes by 10% on short time-scales (over 20days), by ~30% over a year, but can change by 100% or more for individual AGN.The EUV gap is the most uncertain part of the intrinsic SED, introducing a ~25%uncertainty in the accretion-induced luminosity, relative to the modelindependent interpolation method that we adopt. That aside, our analysis showsthat the uncertainty in the accretion-induced luminosity, the Eddingtonluminosity ratio and the bolometric correction factors can be reduced (by afactor of two or more) by use of SEDs built from data obtained within 20 days.However, mass accretion rate and mass accretion efficiency are mostly limitedby the unknown EUV emission and the unknown details of the central engine andour aspect angle.

Spectral Energy Distribution Variations of Nearby Seyfert Galaxies During AGN Watch Monitoring Programs