This might be a problem for the 1%. Either way, I often finish typing derby with 30-60 seconds left, and having all controls locked without any ability to stand up and move around for that amount of time really sucks.
EDIT: So I noticed that this isn’t a problem when you’re playing solo, as the timer is reduced to 10 IIRC. But if you play with other people, you have to wait for them to finish, which means you can wait for up to a minute depending on how fast you are compared to the rest.