Opinion needed: How many days is optimal for B2C SaaS trial? 7? 14?

It depends on how long it takes to run the trial from setting your account, parameters, and features to running the SaaS as it is supposed to be. Some SaaS require a more extended period to get used to or at least have to get to know the full potential. You don't want a trial that would stop people from getting to that point, or you may just lose potential paid customers. I would suggest recording tutorials on how to use the SaaS from start to end. That would make a 7 days trial viable and exciting, since it may increase FOMO if you are running some discount, and people could get a great insight into how great your SaaS is, from this tutorial. Your own experience from how many days you get to have a good feeling about your own SaaS can be used to decide on the trial period. I haven't yet launched my SaaS but that's a recollection of all the good advice I collected so far.

I'd say it is all about split testing. What you can do is get ideal customers on the call and then ask them directly. I know it sounds cliche but it is true. The only catch is that you have to incentivize them by giving away something valuable for free such as 30 days of your SaaS service in exchange for jumping on a call with you. But you'll be able to hit 2 targets with 1 arrow: - get market feedback - get potential customers It pays to listen to the market!

As others have already said, it does depend a lot on the type of product and how long it takes for someone to establish whether it is the right tool for them and whether they would be prepared to pay for it. Whether you also offer a 'free' fallback option as well will also have an impact, as well if you offer any form of implementation / setup support. Arguably 14 days is the 'standard' which most vendors offer, but I'd argue for B2C, you'd possibly want to consider longer, especially if it requires the vendor to implement something on their side in order for the end consumer to leverage.