It depends on how many people donate in the round. As of right now there are 212.5 STEEM sharing 20,000,000 DLUX. There are some minor weights associated with this over this time period, but in general if nobody else donates for the rest of October you will receive a little less than half of the 20,000,000 tokens for the round as you've donated 100/212.5.

You are participating in a social network though. The more distributed the ecosystem is, the more variety of content you have, the more the value of the reward pool, the utility of the token... everything depends on number of users, it's network effect. Therefore, more tokens you receive per amount invested the less successful your investment. We hope to lock in a much smaller amount of tokens at the end of October for you. ;)

Everybody who participates after you will have a lower weight applied to their investment so we all have incentives to grow the network. You can find more information about the realtime values at dlux.io/ico and in our releases.