Player development

Hi people new to this game

How long does it take to level up a player ? I’ve been playing 3 weeks and it seems like none of my players are going up even tho I’m training every day

They have to be training at a decent level to actually level up:

Think of each stat as a bucket needing to be filled, If you train on aerobic for example which only works Stamina, fitness and acceleration stats, and your player does 99XP then that's 0.99 buckets of water distributed across 3 stat buckets. If your player was already near to filling those buckets, he could go up by one in every stat, if he wasn't close to filling up those buckets then he may not have any stats improve but will fill them up so that next time, he will go over and start a new bucket. These "buckets" are indicated by the green bars which tell you how full the bucket is. The 99% will not necessarily be divided equally between the 3 buckets though - depending on how much effort you put into each stat on the training screen. Training without a trainer means the training will be split across every bucket.

Taken from the noob bible above ^ which explains it well