  We study the transit timings of 10 exoplanets in order to investigate
potential Transit Timing Variations (TTVs) in them. We model their available
ground-based light curves, some presented here and others taken from the
literature, and homogeneously measure the mid-transit times. We statistically
compare our results with published values and find that the measurement errors
agree. However, in terms of recovering the possible frequencies, homogeneous
sets can be found to be more useful, of which no statistically relevant example
has been found for the planets in our study. We corrected the ephemeris
information of all ten planets we studied and provide these most precise light
elements as references for future transit observations with space-borne and
ground-based instruments. We found no evidence for secular or periodic changes
in the orbital periods of the planets in our sample, including the ultra-short
period WASP-103 b, whose orbit is expected to decay on an observable timescale.
Therefore, we derive the lower limits for the reduced tidal quality factors
(Q$^{\prime}_{\star}$) for the host stars based on best fitting quadratic
functions to their timing data. We also present a global model of all available
data for WASP-74 b, which has a Gaia parallax-based distance value ~25% larger
than the published value.
