30 Day Trial or 7 Day Trial?

You said it yourself, if most people are making a decision within 24 hours why give them an entire month?
Shorten your sales cycle and limit the trial to 7 days.
You can always extend a trial on a case-by-case basis.

I think that 30 day trials are better than 7 day trials because in the first 24 hours people find out if the program is good or not, but after, they might find out some things that may not be good in the software and may ask for a refund

Youll get more customers with a 30 day trial. If you give customers what they want they will return for more.

make it 30 day trial..after using 30days,they wud be used to it..so max chances of purchasing your software

Your data leads me to believe that 7 days is the way to go. . . unless you think there are people slipping through the cracks. If you keep the 30 day trial, I would suggest a check-in phone call at the 2 week mark. Make sure your customers have used the product, and find ways to sell it.

If your customers make decisions within 24 hours, I would reduce it to a 7 day trial. Why give extra time for free?

I like 7 days. If someone likes a product, it shouldn't take 30 days to commit.

I recommend that you actually drop it to 7 days or even 5 and if you're not, offer a 100% money back guarantee. That way customers will not feel risk aversion when making the decision since their money is guaranteed to be back. However, if they like it then it's nearly impossible that they'll ask for a refund since it's now "theirs". On the other hand, from my experience, if you offer a 30 day trial people may just use the program and be done with it within 30 days hence allowing you no profit. You need to optimally minimize the number of trial days by looking at your data and offer a 100% money back guarantee. I would say to a 3-5 trial and offer customers a 110% money back guarantee.

I think a 30 day is best. Example from my life: yoga studio down the street has a 7 day trial. I don't sign up now because I know I am busy two nights this week and "maybe next week I will be able to use the trial to its fullest capacity." If it is 30 days, I feel like I can start immediately because I have a whole month to utilize the trial. This isn't software, but the same basic psychological principles apply.

I believe a 7 day trial would be the way to go. I have used 30-day trial software, and while I know I want to purchase the software, the fact that I get a 30-day trial gives me less incentive to purchase it sooner, and, some of the 30-day trial still have loopholes where you can stretch out the trial. I have stretched out a 30-day trial to nearly a year and a half, and I was using the software continuously.

Go with 7 days and offer a money back guarantee. Tell them why let them know you have done your research and you know your business. It will give them an extra boost in confidence in you.

While I understand why you think dropping the trial to seven days is a good thing, I don't see how you would benefit. Your clients will either buy or not. However, they may NOT try at all with a 7-day offer. (At least, that's the way I work.) I KNOW I might not get to a test within seven days. I THINK I will within 30. Fact is, I'm the same as your customers--I buy right away if I'm going to buy at all.
Of course, the gold standard is a split test. That will tell you more than any one (or small population's) person's thoughts can.

I would stick with a 30 day trial, because I've noticed that I sometimes don't get a chance to use new software within that first week. What I would do if I were you in your situation is send a feedback survey after 14 days. At the 28 day mark, I would send a reminder that their free trial is about to expire; with at least two options for the purchase of the paid version.

I think even if they rapidly make a decision they may not get around to sharing it with you. 30 days will always sound like you are getting more even if that decision is already made.

30 days would be my vote. Its more prevalent among software.