Science, you're doing it wrong
One preview page from Amazing Spider-Man #591, from here.
Now I'm not exactly a physicist, but I don't think time works that way. If they were in this Macroverse two years ago, and since then a lifetime has past, wouldn't that mean time moves faster in the Macroverse? So they really shouldn't be concerned about missing anything. If anything they should worry about getting stuck there and dying of old age before Valeria the super genius can come get them.
Of course I failed high school physics, so hopefully someone can explain to me how this works.