In term of "spending" my answer is ZERO, simply because I do not spent time, I discover things casually or when I feel the need of something and it's nearly always there, ready to go in my config (org-mode based) with a quick cut&paste.
Sometime yes, I found a thing that require more investigation or something happen and need action but with modern Emacs is far simpler than undebuggable monsters like Eclipse or Netbeans dotdirs.
BTW there is no difference in terms: plugins, extensions etc; core Emacs is an elisp virtual machine and anything are simply sexps, from my own config to the most famous major mode like org.
About modern IDE: in Emacs I do anything from mail (notmuch-emacs) to personal finance (ledger) to slides (org-mode with skeletor/yasnippet and reveal.js/beamer) to other documents, to deploy documents, live in org via babel, to window manager (EXWM) etc. No IDE or other app exists that can do anything with the level of simplicity, effectiveness and integration of Emacs. Even in terms of mere editing modern IDE are not integrate with anything but barely themselves so you need tons of different apps to do a single thing, in Emacs everything is there.
In terms of time: I was a hardcore vimmer for decades, at a certain point in time I feel the need of something different and I decide to try Emacs. Initially as an editor, after as MUA, after as agenda, after as a file manager, after as a ... discovering new things regularly and ease my life like never before.
Sometime yes, I found a thing that require more investigation or something happen and need action but with modern Emacs is far simpler than undebuggable monsters like Eclipse or Netbeans dotdirs.
BTW there is no difference in terms: plugins, extensions etc; core Emacs is an elisp virtual machine and anything are simply sexps, from my own config to the most famous major mode like org.
About modern IDE: in Emacs I do anything from mail (notmuch-emacs) to personal finance (ledger) to slides (org-mode with skeletor/yasnippet and reveal.js/beamer) to other documents, to deploy documents, live in org via babel, to window manager (EXWM) etc. No IDE or other app exists that can do anything with the level of simplicity, effectiveness and integration of Emacs. Even in terms of mere editing modern IDE are not integrate with anything but barely themselves so you need tons of different apps to do a single thing, in Emacs everything is there.
In terms of time: I was a hardcore vimmer for decades, at a certain point in time I feel the need of something different and I decide to try Emacs. Initially as an editor, after as MUA, after as agenda, after as a file manager, after as a ... discovering new things regularly and ease my life like never before.