This is not easy to say. But like I said before Ethereum needed around 2-3 years to reach the market cap of 30 billions.
With IOTA this could go way faster because there is a huge crypto awareness already and investors are waiting for the next big thing. Also a lot of money is already in crypto (BTC and ETH) and could flow faster.
So when more people realize what this project can achieve and the potential of it, it could happen pretty fast, in a timeframe of 2-4 months even.
I expect more a jump to 5-10 billions market cap over the next months. Then some correction, then full hype. So beeing on a more optimistic side I would say it could be even end of 2018.
Following things will add to the market cap of IOTA:
- more exchanges (Bittrex is the next, they already started following IOTA on twitter)
- announcement of coordinator removal and full decentralization of IOTA
- more corporate agreements, also it seems governments will work with IOTA
- announcement of smart contracts integration into the IOTA code
IOTA will have some bigger upgrades.
Also what I like is that they try to keep the fundamental network and code clean as possible and will allow some kinds of slots and modules (IX) for more functionallity.
Also expect another hype. The InternetOfThings hype.
This one could synergize with the growth of IOTA.
This video is amazing, it explains the supply and transactions speed of IOTA:
https://youtu.be/y7JPQng-Vjc
bittrex is not going to list iota. Ask yourself why they haven't yet. It's because it doesn't work.