People aren't forced to work nights and weekends during lockdown, although some teams may up their expectations for people to do that. I haven't been on a high-priority project for a lockdown, but I imagine it is possible that some go overboard. I also imagine it is likely that the guys who have good reasons to not stay late or work weekends also teach the guys that go overboard a thing or two much of the time. Working a few nights and weekends for a known short period of time is different from a death march, making it a habit, or having a culture that expects it all the time. Much like I imagine Sheryl does a few late nights in a row and an impacted weekend every once in a while to overcome some time-sensitive hurdles to the company's success.

The message is that the company is going to make it easy to work on and focus on the particular high-priority projects you are involved in by increasing the rate and operating hours for shuttles and kitchens, and making it even more culturally acceptable (and even dutiful) to avoid distractions like meetings, lower-priority projects, and so forth. Obstacles to getting work done, whether during usual office hours (which are already not that usual) or not, are reduced or removed.

For me, the lockdown concept gave me an opportunity to consider working on more important things than the things that just happened to be in my tasks list, my appointment calendar, what people in team meetings thought was important, and so forth. Lower-value meetings started happening less frequently or being indefinitely postponed. In terms of time, I think I ended up working less at the end of lockdown than I did before it started.