Survey Solutions Limits

July 1, 2021

The table below summarizes some of the Survey Solutions limits.
It is not advisable to design a questionnaire on the margin of these limits.

Limit Value
Maximum number of questions in a section: 400 [questions]
Maximum number of roster elements in a single roster (including rosters nested into it): 10,000 [items]
Maximum number of roster elements in the whole questionnaire: 80,000 [items]
Maximum question text length: 500 [characters] 
Maximum length of a variable label: 80 [characters]
Maximum variable name length for most question types: 32 [characters]
Maximum variable name length for GPS and some other question types: 20 [characters]
Maximum number of GPS questions marked as prefilled: 1 [question]
Maximum nesting depth for rosters: 4 [levels]
Maximum nesting depth for sub-sections
(not including the section level):
9 [levels]
Maximum number of items in a roster: 60 [items]
Maximum number of items in a simple roster: 200 [items]
Maximum number of questions* in a roster to qualify as a simple roster: 30 [questions]
Maximum number of questions in a roster to be shown in plain mode: 10 [questions]
Minimum number of items in a categorical question: 2 [items]
Maximum number of items in a categorical question: 15,000 [items]
Maximum number of items in a categorical question
(with all options visible to interviewer):
200 [items]
Maximum number of validations (rules and messages) that can be attached to a single element: 10 [validations]
Maximum number of suggestions in a combobox categorical question: 50 [items]
Maximum length of a category label in a categorical question: 250 [characters]
Maximum number of list items in a text list question type: 200 [items]
Earliest date that can be entered into a date question: 1 January 1900
Latest date that can be entered into a date question: 31 December 2100
Maximum length of a syntax condition: 10,000 [characters]
Maximum length of an error message: 250 [characters]
Maximum number of decimals in a numeric question: 15 [digits]
Maximum number of data rows in a lookup table: 15,000 [rows]
Maximum number of data columns in a lookup table: 10 [columns]
Recognized barcode formats: see list
Supported graphic file formats for upload to static text: .jpg & .png
Maximum size of a single image for upload to static text
(larger images result in warnings): 
5 [MB]
Maximum size of the longer side of captured images: 1024 [pixels]
Maximum duration of record in audio question: 3 [minutes]
Maximum size of the preload file: 300 [MB]
Maximum size of the (zipped) map preload file: 500 [MB]
Maximum size of the questionnaire (not including attachments) 5 [MB]
Minimum length of a required password**: 10 [characters]
Maximum number of user accounts that can be created in a single batch: 10,000 [accounts]
Maximum size of an image for Headquarters login page: 10 [MB]
Maximum number of markers*** in Headquarters map report: 50,000[markers]
Reserved value (numeric variable types): -999,999,999
Reserved value (string variable types): ##N/A##
Length of an internally generated case ID (GUID): 32 (hexadecimal digits)
Length of a comment: 500 (characters)
Timeout for inactive web-interviewing sessions: 15 (minutes)
Maximum number of unsuccessful login attempts before a CAPTCHA gets activated: 5 (attempts)

*) in addition to the limit on number of questions a roster may not contain nested rosters to qualify as a simple roster, read more details here;
**)  in addition to the requirement for password complexity: at least one digit, at least one lower case character, and at least one upper case character;
***) Since version 18.12 large number of markers will be clustered on the server before being shown on the map.