I am just hoping and praying that we'll get through the next critical time period as the worms die off. (yourpetsbestfriend.com)
Perhaps spreading him too thin at the most critical time period following the penalties when this team needed to regroup. (sbnation.com)
The most critical time period is seven to 10 days following a melarsomine treatment, but these signs can occur anytime in the following month. (vin.com)