There have been a couple of good responses here that seem to cover a lot of the spectrum for build times.
Largely your build time will vary on a couple of factors:
- Your available build time per week.
- Do you only have a couple of hours a day to work? it will take "longer" just because it is a process that takes time.
- Do you have experience with the medium? with experience comes speed, and proficancy. so start with smaller simpler parts before tackling the bigger and more statement suit pieces.
- What is the level of detail you are expecting? High-detail suits have inherent complexity that requires more time and effort to get right.
- Which suit (or combination) are you making?
- There are a wide variety of suits and armor that make up the Halo franchise. And some are more technical on their face and others are simple products of their time and do not have the level of detail to construct.
- do you already have a unified vision of what pieces you plan to use? doing the leg work to know what you want to make and how to piece it together is a great help to having consistent progress. (I didn't have a consistent vision of what I wanted and "wasted" time building parts of my armor that I ended up not using.)
- Do you already have the space and tools to begin the process?
- there are a lot of methods of making armor and they all have a different set of tools and materials. Check out the tutorials section of the forum to find the way you are going to build and learn all you can.
All that said I will give a simple example of version 1 of my armor:
I used a method called Pepakura. It is an older method of crafting and can be extraordinarily time-consuming to start out with.
it took me nearly 7 months just to get all my armor into a state where it could be hardened.
Then another 5 months to harden, detail, and paint.
The process can be time-consuming but depending on the method things can be faster.
I have used eva foam and an eye for free hand to make new pieces over the years and I can build and finish pieces in just a couple of weeks. (with about 2-4 hours of build time during weekdays.)
So find your niche. start with something simple like the hand plates for the back of a glove. then build something you wouldn't mind displaying if it is the only other thing you finish (a simple helmet to start with) and then work from there. use what you finish as inspiration for the next piece and just keep working. don't depend on someone else's timeline. build at your pace and come here for support if you run into snags.
We are more than happy to give advice and pointers on things to make the process easier. And if you need an honest review of a completed piece there are plenty here that can give constructive criticism on ways to improve.
At the end of the day, this is a hobby and should be fun for you. I wish you luck and look forward to seeing what you can bring to the community!