IMO if you are lucky to work with some good tiler,in 2 years you learn enough for go faster.If you work alone,need more time and more mistakes.I was really lucky to work with one good teacher,who learn from his father,and have 40 years experience,day by day,even Sunday,never Holiday,If not go to work Sunday,we work in his garage to clean tools,some time to modified or invent tools for next day work.After 2 years day by day with him,I was pretty sure I'm never become a good tiler,everything I do was not right,and show me one better way to do it quick and better.After I start the first job alone I was really impressed by how growing my skills,I start one big floor,aprox 400sqm ,300x300 brick.I fit every day 80 sqm alone,talk to myself and follow the good advice received ,start at 7.30 and finish at 5 o'clock.6 bags adhesive before launch and 6 bags after launch.So,alone even after 5 years you can't achieve the same experience like you can receive in 2 years if you work with good tiler.