There might be long 'intervals' during/in which nothing happens.
There are signs 'at' regular 'intervals' along the outside wall.
There will be a 20-minute 'interval' between acts one and two.
(..) Once you reach your objective, Dillon will evaluate the situation and take charge. Rendezvous points and radio freqs are indicated and fixed. - AWACS contact on four-hour intervals. - Who's our backup? No such thing. This is a one-way ticket. Once we cross that border, we're on our own. Billy! (..)1987 Predator