Not sure what limit you’re talking about. If you mean how many items can appear in the Recent tabs menu then yes I guess there is a limit, as there is for all other browsers afaik.
If you wanted to recover these tabs, as @Saoiray is stating above, going to Menu --> History --> Recent tabs --> Restore window would be the way to go (note that afaik there is no limit on how many tabs can appear in a window here. So for example if I had 100 tabs open in a window, closed that window, then went to Menu --> History --> Recent tabs there would be an entry there that said 100 tabs > that I could restore).
If your tabs/window is not appearing there then unfortunately there’s not a lot to do here. I would highly recommend using a tab manager extension or saving your tabs as bookmarks more frequently. Note that you can right-click and select Bookmark all tabs... to do this easily:
