The phrase "a rigorous time" is correct and usable in written English.
It can be used to describe a period characterized by strictness, intensity, or thoroughness, often in relation to a schedule or set of activities.
Example: "The team faced a rigorous time during the project deadline, requiring them to work long hours and maintain high standards."
Alternatives: "a challenging period" or "a demanding time".
Workdays have a rigorous time structure.
This is markedly similar to what you do in screenwriting, where you have a very defined space to work with in terms of a rigorous time limit, and you want to create the conditions for an emotional rapport with the audience by using different rhythms.
However, the parties led by the Obama administration are pushing very hard for Iran to keep to a rigorous time line with likely sanctions if Iran does not cooperate; Iran might dawdle at its peril.
A rigorous time-dependent analysis provides insight on structural behaviors of reinforced concrete (RC) frame structures with changes in design variables, such as the types of shoring systems, the shore stiffness, and the shore spacing.
Women just have a more rigorous time physically than men.
Linklater contrives a remarkable, rigorous time-lapse study of a boy growing to manhood over 12 years.
I am increasingly convinced that one of the reasons organizations fail to implement their plans -- often after a relatively rigorous, time-consuming and expensive planning process -- is that the plans do not set out clear priorities.
I have to say I'm not sure I would have survived such a rigorous training time without those local cryotherapy treatments.
Using rigorous time series models, this study arrived at some startling conclusions.
"These newer faculty track types have various requirements for promotion and tenure but typically contrast sharply with the rigorous time limitations of the TTT type.
Using a subgroup of eight randomly selected mice from the three test strains, we conducted a fourth exposure protocol consisting of 2 hr of O3 followed by 3 hr of FA (O3FA), using the same rigorous time schedule as described above.
