It's the activity that's being done on the account.
The captach is a dynamic system. Once the system thinks you're human enough. It will let you skip the captchas.
It's not a specific amount. It depends.
Login captcha is always there.
Post or comment captcha: you always get a captcha on your first post or comment after login.
From observation, after your first comment or post your second or more comment or post will get either a guest list pass and no captcha or a white captcha that you just click thru (I think it's a bug that has been published by the admins).
It's the activity that's being done on the account.
The captach is a dynamic system. Once the system thinks you're human enough. It will let you skip the captchas.
It's not a specific amount. It depends.
Post good content and have good activity and it should take like 2 weeks.
/post/135143fd21cee04102e4/#c-3203209203d2084216
/post/2420fdf236dfd13a4414/#c-62cc674e41fbd18dde
/post/26f0bd51527d3291386e/#c-dff60fba20a8cf0f3b