Increased timeout to fix build failure on slow GitHub build systems

[hylkevds]

Builds are sometimes failing on the GH build systems due to a timeout. This PR increases those timeouts from 200ms to 300 ms and puts the actual value of the timeouts in a constant for easier access.

[andsel]

This is fine, just a suggestion on the constant to transform in a Duration which is more explicit express what is it.

[hylkevds]

This is fine, just a suggestion on the constant to transform in a Duration which is more explicit express what is it.

Good idea!
I did change a few int parameters to long, to avoid casting.
It's a pity that CountDownLatch.await() doesn't accept a Duration, that would have been even cleaner :)

[andsel]

LGTM