Let's chat for a bit vs Let's chat for a while

Some examples from the web:

• Let them chat for a bit.
• Let's step outside, chat for a second.
• Let's go in the back and have a bit of a chat, shall we?
• Let's finish up a bit.
• Come on, Belkin, let's let the ladies chat for a few minutes.
• May we chat for a bit?
• Let's make it a bit more interesting.
• Let's talk a bit about your smile now.
• Let's let the bad boy out for a bit.
• Let's see a bit more shoulder.
• Let's just say nothing for a bit.
• Let's write something a bit more sentimental...
• Let's go, we have a bit of youth left.
• Let's explore all this a bit more...
• Let's explore thなる a bit more.
• Let's talk a bit about your books.
• Let's talk a bit about your peculiar, self-taught fingerpicking technique.
• Let's try something a bit more elaborated.
• Let's talk a bit about his philosophy as a coach.
• Let's pick a bit of data from another three-month-old patient.

Some examples from the web:

• Let's step outside, chat for a second.
• Come on, Belkin, let's let the ladies chat for a few minutes.
• Let them chat for a bit.
• Let's go have a chat with Preciado.
• Let's have ourselves a little chat.
• Let's enjoy a delicious dinner, whilst having a chat.
• So let's chat about how great that is.
• Let's have a little chat about it.
• Let's go chat up the widow.
• Let's chat at Ivy Dickens' party tonight.
• Rather than looking for my daughter, let's just sit here and chat.
• Look, we all want to save face here, so let's chat.
• Okay, Metin, let's chat.
• Let's check Levi's chat history.
• Let's chat about darling little Kaitlyn.
• Let's bring Finn's co-stars in for a chat.
• Nice to see you, Liz, Let's chit-chat.
• Then let's chat with those two perpetrators.
• So let's take an example that we all face: chat - text messaging.
• Let's have a chat, Baek Seung Jo.