Intermittent fasting — or going certain windows of time without food — is all the rage, praised mostly for its anti-inflammatory and gut - healing benefits. (mindbodygreen.com)
Does your job give you access to «confidential information», such that you can only buy or sell shares in the company during certain windows? (money.stackexchange.com)
However, there are certain windows when teacher availability and / or course access is limited. (sunwestdlc.ca)