Well it all depends on what you want to do. I interpreted your question as we need to go there asap, what can we do? And then the answer is we can do an crewed orbit in about a year time.
If we just want to do it with a good chance of survival, building all the shit we need, but still get there soon, the answer would be different. If we just want to go fast, we would probably use all our heavy lift vehicles to build a moon vehicle in LEO. Then put a big ass engine on that and a bunch of fuel and launch the whole thing to the moon. That’s something we could do within 5-7 years if we would put our minds and money to it. I feel the suits we currently have in development could be ready within that time as well. The lander would be a problem however, we don’t have any of those in development right now. Blue Origin has their Blue Lander, but that’s been on the drawing board for so long now. They did get extra funding to get it ready for 2030, but haven’t shown their progress publicly, so who knows how far they are. On the other hand, if we want to take some risks for this special mission I’m sure we can get something together in 5-7 years if humanity unites and puts their weight/money/faith behind it.
However if we keep going like we’ve been going since Apollo was cancelled, we are never going to get there at all. The politics are complicated and the private sector has been hit or miss. Plus with the Musk factor, we don’t know what’s going to happen. I have zero faith in anything we have going right now.
