If they just wide swing you you're kinda fucked no?
20 seconds is long, but it isn't close to half the round.
If he pops early in your vicinity, you know roughly where he is and can play around it
If he doesn't and only pops when engaging, you have a very good idea of where he is.
Anyone can silent peek you.
On defense, hold chokes, force his wall out, use mollies & util to break shield.
On attack hold retake chokes, play bomb.