You're asking for a long evening at the very leastHow do-able are solo Athenas? I'm tempted to try, but all of the Athenas I've done have been in groups of 3 or 4 and were pretty difficult due to the amount of skellies. Am I asking for a ruined evening if I try to solo one of these?
If you re-roll to get good OOS islands, and make sure you have gunpowder-a-plenty for the possibility of metal wave after metal wave in hard to get places.... you might be able to do it in 2.5 hours? It's just really tough and risky, but doable
It's completely anecdotal, but most of my group feels skeleton spawn rate is related to your crew size, or number of people on an island. Like how chests are quicker to dig up on a sloop (or a 2 person brig). So that should provide you a little slack compared to what you're used to