Interval problem while using BBR PacingEnabled?

[noah-hwang]

bbr.c：The code is as follows

else if (
!TimeSinceLastSendValid ||
!Connection->Settings.PacingEnabled ||
Bbr->MinRtt == UINT32_MAX ||
Bbr->MinRtt < MS_TO_US(QUIC_SEND_PACING_INTERVAL))
///////////////////////////////
//
// The number of microseconds between pacing chunks.
//
#define QUIC_SEND_PACING_INTERVAL 1000
///////////////////////////////
1.QUIC_SEND_PACING_INTERVAL is Nanoseconds or milliseconds？
2. Bbr->MinRtt < MS_TO_US(QUIC_SEND_PACING_INTERVAL)
Is it correct？

Thanks!!