Look ay Labtops sticky threads, the details you seek are very well described, or UTSE, its all here
If you want to make glycol then as rhodium mentioned remove traces of acid for storage,
But if the goal is to make ketone, then after stirring for 24 hours, pour into a seperating funnel and let the layers seperate. Remove the DCM layer and distill DCM away until monoformyl glycol is left. This is done at atmopsheric pressure and until the liquid temperature reaches 80DegC.
Then hydrolyse with 15% H2SO4 as described. The wash of the crude ketone is NOT done by using NaOH but by using a saturated bicarb solution. Then vacuum distill the ketone.
Abacus