FNV316

WRobot doesn't have such a function, but you can create your own using Lua: http://wowwiki.wikia.com/wiki/API_GetMirrorTimerInfo
HMP uses Lua events to decide wether you need to swim up again, see "Related events" at the bottom

Create a follow path step that leads right before the portal, add step "Run Code" and insert one of these two codes:
wManager.Wow.Bot.Tasks.GoToTask.ToPosition(new Vector3(123.456, 123.456, 123.456)); For 123.456 you insert the coords of a point behind the portal.
Or:
while(Usefuls.ContinentId == (int) ContinentId.Azeroth) { wManager.Wow.Helpers.Move.Forward(Move.MoveAction.PressKey, 1000); }