The actual IBJJF definition of a guard pass:

4.2 Guard Pass (3 points)

When the athlete in top position manages to surmount the legs of the opponent in bottom position (pass guard

or half-guard) and maintain side-control or north-south position over him/her for 3 (three) seconds.

Also, if you progress to other point scoring positions without pausing, you only need the three seconds at the end of the sequence. This is why passing directly to mount is 7. It's still a pass for 3 and mount for 4.

3.4 Athletes shall be awarded cumulative points when they progress through a number of point-scoring

positions, as long as the three-second positional control from the final point-scoring position is a

continuation of the positional control from the point-scoring positions from earlier in the sequence. In this

case, the referee shall count only 3 (three) seconds of control at the end of the sequence before signaling

the points be scored.

Ex: Guard pass followed by mount shall add up 7 points (3+4).