Redmine

It is perfectly logical and reasonable to plan to start issue B the same day issue A is resolved. There's no reason to enforce in planning a "A's done! Everybody go home early!" rule. It should be entirely practical to plan to resolve 100 sequential issues on a single day, though perhaps a bit optimistic even just for the overhead of closing them out.

Somewhat more ambitiously, one could argue that the end should not be fewer days after the start than the total anticipated hours / number of people assigned / whichever is less (hours planned to work | 24 hours per day).