sshell inherits the limitations of the FaaS infrastructure, including the time limit. Regarding the big data use case, more work is necessary to assess this, but the applications we have written so far were competing both in terms of efficiency and pricing (Section 5 in [1]).
[1] https://drive.google.com/file/d/1D7h0hoMep0W73XV_EdXPSEWUxpT...