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How Long Does It Take to Become an Effective MSL? What 858 Medical Science Liaisons Told Us career development kol engagement medical affairs medical science liaison msl career and job search tips onboarding Jul 01, 2026

By Sarah Snyder & Patrina Pellett

How Long Does It Take a New MSL to Become Effective?

Most Medical Science Liaisons take 1–2 years to become truly effective in the field, not just technically competent, but confident and high-performing.

A LinkedIn poll of 858 MSLs confirmed it:Β 

β†’ 45% said 1–...

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