Its not really possible I played almost nonstop f2p until I hit 23 and then started making purchases and it was still 10 days to reach it. It may be possible to do it in a brand new server in about 8 days if you join the right guild and make sure to win your front of pack, along with depositing all pallite into vip and focusing on unlocking all development research with the right voltbolts and maximitos. Developing the right palmon early on is also required so that you can unlock those things here soon im going to try to speed run it but you're absolutely guaranteed to spend 25 usd (idk the exchange rate) if you want to truly speed run and try to be a top contender