The target set by Northern Ireland's devolved Department of Health - which oversees five health and social care trusts - is 14 days.
Mary (not her real name), who was red flagged by her GP last week, told BBC News NI she will have at least a five-week wait to be seen.
She said her doctor was "very apologetic" but couldn't give her a definitive timescale.
"I don't know when I'm going to receive a letter that will give me a date," she told The Nolan Show.
BBC News NI understands that several breast cancer consultants are concerned that waiting times have spiralled since a new regional system for handling referrals was introduced.
The system was criticised for creating a postcode lottery network as, depending on a patient's address, some were being seen more quickly than others.
Before its introduction, health trusts managed their own red flag referrals.
In May, all red flag referrals in the Western Trust were seen within 14 days, making it one of the better performing trusts at meeting its target.
However, within weeks of the regional system starting, some patients were waiting up to seven weeks, with the latest data showing 250 patients waited more than 14 days for a red flag breast clinic appointment.
More than 1,100 people across Northern Ireland are on a red flag list.
Sources have told the BBC that some of the health trusts feel they are in a better position to manage the lists, but as some breast units are better staffed than others, this does not produce an equitable appointment system.
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Source: BBC News, 27 August 2025
One health trust source told BBC News NI that the regional system was proving too complex to manage, with projections of waiting lists rising to 11 weeks by the end of September.
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