Rise: the clock is a guide

In a few sentences

In brief

A recipe’s rising time is a guide because temperature, dough quantity and shaping affect the rate.

Useful to know

A recipe’s rising time is a guide because temperature, dough quantity and shaping affect the rate. King Arthur recommends observing the signs of readiness as well as the elapsed minutes. [1]

In a cooler kitchen, a loaf that has not reached its expected volume at the stated time has not necessarily failed. Check the conditions and the directions for that bread. Do not apply a universal doubling rule to every dough. Notes about temperature and visible changes are more useful for the next attempt than adding yeast at random.

Sources

For further detail and to check the information:

[1] King Arthur Baking — how to tell if bread dough has risen enough ↗