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Sallie Mae is really inconsistent with removing negative tradelines after rehab. They will remove the collection accounts really quickly, but are not setup to automatically delete the entire defaulted tradeline. There basically has to be a reason, where they did something wrong, for them to delete and even then it is shaky.
By the time you got yourself into default again (which could take up to a year right now because they are trying to keep defaults off the books, it took 415 days for them to put me in default) and then went through rehab (9 months plus waiting for the loan to be sold = weeks to months) you would have 3 years or less of these being on your report. If you are one of the lucky few who got their tradeline deleted it would be worth it, otherwise you have given yourself a lot more lates.