It is true. Bounty earnings depends upon the number of participants who participated the campaign. The more bounty hunters participated in the campaign the lesser the token they will receive as this will be distributed to all who are participated. What usually specified in the campaign rules and regulations is that, the highest rank bounty hunters will be paid much higher compared to the lower ranks. Each ranks has an equivalent tokens receive in each successful week of the campaign. And I think the reasons why there is longer period of time set in each bounty campaign, it's because due to the hard cap target that needed to achieve and this will be more worthy to received payments when succeeded.  

that completely depends on how many people have signed up for the bounty campaign. I have gotten paid big chunk from longer bounty programs than shorter ones. There are so many other things you have to consider which can effect your earning. It looks like he signed up for the wrong ICO and he just has to switch as they can delay it again.

I think there is no strng correlation between duration of ICO period and amount of stakes you earned at the end. The number of stakes is affected by your rank on forum and the success of the campaign, in general. Of course, I mean this only signature campaigns (usually not more than 20-30 forum participants agree on that type of bounty).
All other types of bounty live by their own rules.

Not necessarily. It's subject and based on  several factors. You can't get small returns of the participants are very few. The states earned would be shared accordingly.

Whether or not I earn a lot of bounties depends on the number of participants and the length of the campaign. Often, projects typically spend 2-5% of the Token issued for Bounty. And if the bounty has a limited number of people and takes place in a short time, then surely the profit will be huge. It also depends on whether the ICO project sells the Token and gains a hard cap. If the project reaches a hard cap or soft cap, then they will pay more Token per skate for members.

decisions are all in your own hands, do not be easily influenced by the decisions of others even though it's a close friend of his own. do your own will, do not expect something that is not certain, if indeed the bounty program that you follow the project has not succeeded, you better make as experience for the future. do not be too focused to get something from the gift program, because most ICO not necessarily everything can run smoothly, there are always obstacles encountered.

I think that it is worth staying if the project is steep and prospective, because there is a potential for strong growth in the future

Have patience and this is true that when the bounty gets longer reward is reducing because some successful ICO contains many participants so when the no of participants increased from expectations then the bounty manager has limited budget,what he does he starts reducing no of tokens as the ICO date is approaching near.In early two months the reward is high but when the participants increase then reward is cut short.Its true.

As more and more people are involved in the bounty, the number of bonuses is limited but the number of people involved is increasing, so the reward is becoming less and less.