Limits · Henkan Research Docs

Interview lengths, languages, reminders, resume window, rate limits, quotas and retention in one place.

Studies and interviews#

Item	Limit
Target interview length	10, 15 or 20 minutes
Interview languages	French and English, chosen by the participant
Response modes	Voice and video, text, or both (at least one)
Participant age	18 or older
Resume an interrupted interview	Within 24 hours of starting it
Objectives (recommended)	2 to 5
Topics generated by the AI	4 to 7 (up to 8 kept)
Coach suggestions per step	2 or 3
Saturation analysis	From 2 completed interviews; window of 2 to 5 interviews
Default target per profile	6 completed interviews

Item	Limit
Invitation placeholders	`{first_name}` and `{link}`
Invitation languages	English or French
Automatic reminders	Up to 5, each between day 1 and day 59 after the invitation; default day 3 and day 7
Emails from the daily reminder job, per participant	1 per day
On-site share of visitors	1% to 100%
On-site "do not show again"	Any number of days; default 30
Public link and on-site invitation	Stop when the study is closed or the total of quotas is reached

These limits protect interviews from abuse. Real participants never reach them.

Action	Limit
Starting interviews from the same network	60 per hour
Starting interviews in one study	300 per hour
Messages in one written interview	200 per day
On-site invitation events from the same network	60 per 10 minutes

When a limit is reached, the participant sees "Too many attempts in a short time. Please wait a minute and try again."

Item	Default
Retention	12 months, set per study; expired data is deleted every day
Transcripts sent to the AI for a synthesis or a question	Every completed interview; very long studies are trimmed per interview to fit
Report links	Valid until revoked, for a validated synthesis only