Sounds difficult. What is the work culture in the country of your friend? Are people expected to work many hours for a company? Does your friend have a family (wife + children) he needs to take care off? Does your friend have some major personal issues to deal with? Maybe your friend has problems working unsupervised on an unpaid project? Perhaps your friend is not really passionate about the idea of the project but does hope for profits in the future?

If some of the above are true, perhaps it’s understandable why your friend can’t find the time. But in that case perhaps it’s better to end the business relationship with your friend.

If I am very passionate about a side project, I can usually find the time to work on it. But I choose to work a maximum of 4 days a week for a client.

To be honest I feel it’s generally a bad idea to be in business with friends. Often friends might feel they can cut each other a bit more slack in a business relationship and this could cause a fallout of the friendship eventually.