How much does decrease on time to arrive the advances on trade route?

50% faster? 100% faster? is better to build a 3rd trade post than improving the trade route with 2 trade post??

Around than 80% for first improvement, less than 25% on second improvement - first improvement is better than extra trade post if you already have 2

However since enemy also benefits from improvements, if they have trade post on same route it is less beneficial to do upgrade

Trade Route | Age of Empires Series Wiki | Fandom

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