It is not easy to reach the target they need for a month.They need to advertise and build up the project to the community first, this way they can gain trust to its future investors.Mostly those who reached the hardcap that only takes a weeks are those hype ICO's and don't expect a high bounty rewards since it is hype lots of bounty participants will join.I like those ICO's and bounties that takes months with limited participants and strict implementation in bounty program they give decent rewards compared to a hype one cause lots of cheaters joining their campaign.