Definition of 何時までも (いつまでも)
いつ
                        何時までも
いつまでも
itsumademo
Common word
adverb
•
                
forever, for good, eternally, as long as one likes, indefinitely, no matter what(usually kana)
Other readings:
                いつまでも《何時迄も》
                Related Kanji
| 何 | what | 
| 時 | time, hour | 
| 迄 | until, up to, as far as, to the extent |