Correct or not?

It should be "since you heard from me".

PieanneIt should be "since you heard from me".

I agree, if only to keep the verb forms parallel. An argument could be made for the original, but I wouldn't propose it.

Or do you think it should be "it has been a while" instead of "it's been a while"?

I'd leave it as it's.

The probably been a while part is a bit strange though...don't you know if it has been a long time or not since you last contacted the other person?

EwanIs this sentence correct?

"It's been a while since I heard from you and probably a while since you've heard from me."

It's exactly as I (a native English speaker of 54 years) would say it. Intuitively, it's perfectly correct. Grammatically, there might be an argument for changing the tense, but then it doesn't sound right!

Why do you think there might be an argument for changing the tense?

EwanIs this sentence correct?

"It's been a while since I heard from you and probably a while since you've heard from me."

I wonder whether the present perfect works in the second part because the other party is now "hearing from" the speaker.

That makes the "hearing from" current again.

MrP