To minimise being delayed at the bridge:

1, Check time of high tide (tables available at fishing shops, or see blackboard on the cabin at the bridge end)

2, Subtract 2 hours, this will be the first opening for that tide.

3, Add 2 hours to high tide time, this will be last opening.

The bridge opens on request on the hour & half-hour between times 2 & 3 above

BUT

This weekend being regatta as well as folk week there are likely some extra openings arranged (and paid for) by the boating folks outside these times, especially on Monday, and any opening is likely to be longer than usual due to the extra boats involved.

My rule is that if I'm planning to cross and am close enough to hear the warning bell clank, it is usually worth the run for it, though not quite always.