<p>Hi game mate,</p><p>If you google a bit your question you will find pages like this one: <a rel="nofollow" href="https://guildstats.eu/character-level?lang=es">GuildStats</a>. Maybe it worths to expend some time in checking them can and playing a bit with the calculator they have. You can check how much experience you need for lvl 400 and substract the current experience you have now. This will give you the total amount of experience you need to gain till that level. Now you can divide it into the amount of days you want.</p><p>Good luck!</p><p>Cheers!</p>