HI:
This is Atlassian's policy:
Advanced Roadmaps can handle up to four issue sources with no problems. The impact of issues sources beyond this depends on their complexity. Alternatively, if you only need a handful of issues from an issue source, consider moving those issues to a different project or using exclusion rules to only pull in the relevant issues.
I need to add about 20 Projects (issue sources). What type of challenges should I expect?
Totally appreciate your comments.
Lesley