Users are limited from entering more than 5,000 contests per slate. For contests with entry fees at $10 and below, users are limited from entering more than 1500 NFL contests, 1000 NBA contests, 1000 MLB contests, 500 NHL contests, 250 EPL contests, 250 UCL contests, 250 UFC contests, 250 XFL contests, 250 CFB contests, or 250 CBB contests per slate.
Entry Limits for Each Contest
All contests have limits on the maximum number of entries that a single user may submit. These limits will be specified in the description of each contest. However, under no circumstances will you be allowed to submit multiple entries exceeding 3% of the total entries for contests with 2 to 4999 entries or 150 entries for contests with 5000 or more entries.
To view the Head to Head entry limits, check out the limit page here: https://www.fanduel.com/contest-entry-limits