Should not have given interview for this company.

Overall 5 rounds. Took around 80 days to complete. So unprofessional
took around 1 month just to shortlist and schedule first round. Another
1 month to finish remaining 4 rounds. 2 weeks to give update about the results. Final verdict is reject

Coding 1: DP based question on graph
Coding 2: 2 questions based on matrix parsing and traversal (Gave working solution to first question, gave solution to second problem but time was up before coding it up completely)
Design 1: Hotel/Restaurant booking system (Interviewer was very much impressed and told me he was super impressed and told kind of perfect design)
Bar raiser: Past experience + projects + leadership questions
HM: Similar to bar raiser round. Past experience + projects + leadership questions

Was waiting for the feedback. I had anticipated that since coding round 2, i did not give full code for 2nd problem, i thought it could kind of give negative vibes about feedback.

But very surprisingly, when I received feedback i was told feedback from design round is kind of negative.

This shocked me and very frustrated and disappointing. Spending 80 days for a company to finish all rounds finally to get a reject is heart breaking.

Should have avoided this company to save time. Seriously 2.5-3 months for interviews?