During the early part of the pandemic, as attendances decreased the median waiting time decreased, to a low point of 1 hours 48 minutes in April 2020.
Yn ystod rhan gyntaf y pandemig, wrth i nifer yr ymweliadau ostwng, roedd canolrif yr amser a dreulir yn yr adran wedi gostwng i isafbwynt o 1 awr a 47 munud ym mis Ebrill 2020.