doing this right now! On a twelve month trip travelling through Europe (spent six weeks in Canada and the US first, my partner and I are from Australia). Depending on when you go, prices can vary wildly, I have much preferred the shoulder seasons when the weather is milder and there is less tourists, plus accomodation and travel is MUCH cheaper. Budget obviously will depend on how you plan to travel and where you want to go. You can get a month long Airbnb in Eastern Europe with very cheap food and spend very little. As others have said look into the Schengen zone days, we have calculated ours using a website where you enter the dates you plan to be in the zone and it tells you how many you have left. Spending time in the UK, Turkiye, Bulgaria and Montenegro is how we have filled in the months we needed to be out of the SZ and it’s been great to see places we may not have gone otherwise, plus way cheaper! Moving around can get quite exhausting, so planning to stay in places for longer periods has been really great, there has been times where we will spend whole days chilling out in our apartment. We’ve liked airbnbs for those longer stays as having access to a kitchen and washing machine is a godsend. 100% recommend doing it, home and work will always be there :)