  The SNO+ Collaboration has recently concluded loading its liquid scintillator
with PPO, the primary fluor, and the loading of the wavelength shifter, bisMSB,
is ongoing. For each stage of the experiment, reliable position and energy
reconstruction is essential, and in the face of a changing scintillator
cocktail, methods have been developed to rapidly calibrate the SNO+ optical
model. To this end, a novel technique for calibrating the time response of the
SNO+ liquid scintillator using in-situ backgrounds was developed. By using
in-situ coincident backgrounds, it is possible to calibrate both the $\beta^-$
and $\alpha$ time responses, as well as facilitate frequent monitoring of the
background levels without compromising the radiopurity of the detector.
Accurate calibration of the liquid scintillator emission times allows the
exploration of time-based particle discrimination, such as between single-site
($\beta^-$) and multi-site ($\beta^- \gamma$) interactions.
