It's a very long process. So it depends on the country, but here in Belgium, it's four years. The rewards can be really extended. We might wait a lot of time before having, for example, publications or ending the PhD. Sometimes it's quite hard to get things within those four years that make us feel confident, rewarding, and gratifying as well. Other things that I'm thinking about as well, in my personal experience, is as an international students it can be quite isolating. When you're moving to a country for your PhD and you have to rebuild your support system in this country. It helps when you have a really great research groups with great colleagues, which is the case for us. But it's not so easy when you cannot always see your family and friends often. I think the PhD is one of those rare jobs and studies that people outside of it don't really know what it's like. It's a bit isolating that when you talk about it with people that are outside of your colleagues, it's not always helpful, they don't really know what to say, they don't always ask a lot of questions, because they're sometimes scared of feeling stupid, that they don't understand exactly what you're doing. So I think all of this can be participating in the insecurities and also the isolation.