How many Tumblr accounters per proxy?

Does anyone have an idea of how many Tumblr accounts I can safely make per proxy?

Same goes with other social media sites, just
to be safe - between 3 - 5 accounts.

NSFW
One proxy - 1 Account
No leave many pictures in queue (50-100)
No more than 30 pictures per day.
Diverse Clickthrough in images (including to own tumblr)
Result: 60 tumblr +5 months working and 30 tumblr +7 months


SFW
One proxy - max 2 accounts
Maximum 200 pictures queue
no more than 40 images per day
Result: 40 tumblr +6 months working and 20 tumblr +7 months