That is very easy to accomplish if you are using flow designer, you can either use the flow action wait for condition = {active=false} of task1 (you can use the generated task as parameter for the action), or directly trigger in parallel the creation of task1 and the wait timer under flow logic, where you pass the value you have from your catalog variable. You have to use the get variables action to get the variable values. Once it reaches the desired timer the task would be generated.

Cheers