370-450 mana depending if they gate or port back to where they came from. At around 15 mana per tick medding for level 40-50 porters, that takes around 2.5-3 min to get back, druids typically sow, so that's more mana, invis is more mana, lev is more, though they are all smaller amounts, they add up. Under level 40, meditate takes longer, probably 4-5 minutes to med it all back. Add 30% or more time if the druid or wizard is picking you up.
This doesn't take into account time spent on waiting for whomever it is you're porting which could add another 5-10 minutes to the porter's time spent.
It's not unreasonable to tip more than the average drop of a hill giant, because the druid or wizard could have killed two of them in that time.
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