Reasoning From The Scriptures pg 403
Is ‘speaking in tongues, to continue until that which is "perfect" comes?
At 1 Corinthians 13:8 reference is made to several miraculous gifts—prophecy, tongues, and knowledge. Verse 9 again refers to two of these gifts—knowledge and prophecy—saying: "For we know in part, and we prophesy in part." (KJ) Or, as RS reads: "For our knowledge is imperfect and our prophecy is imperfect."  Then verse 10 states: "But when that which is perfect is come, then that which is in part shall be done away." (KJ) The word "perfect" is translated from the Greek te'lei-on, which conveys the thought of being full grown, complete, or perfect, Ro, By, and NW here render it "complete."  Notice that it is not the gift of tongues that is said to be "imperfect," "in part," or partial. 1  That is said of  "prophecy" and "knowledge."  In other words, even with those miraculous gifts, the early Christians had only an imperfect or partial understanding of God's purpose.  But when the prophecies would come to fulfillment, when God's purpose would be accomplished, then "that which is perfect," or complete, would come.  So, this is obviously not discussing how long the ‘gift of tongues' would continue.

However, the Bible does indicate how long the ‘gift of tongues' would be a part of Christian experience.3 According to the record, this gift and the other gifts of the spirit were always conveyed to persons by the laying on of hands of the apostles of Jesus Christ or in their presence.  (Acts 2:4, 14, 17; 10:44-46; 19:6; see also Acts 8:14-18.)  Thus, after their death and when the individuals who in that way had received the gifts died, the miraculous gifts resulting, from the operation of God's spirit must have come to their end.  Such a view agrees with the purpose of those gifts as stated at Hebrews 2:2-4.3g


The broader question that I am trying to answer here is when will the spiritual gifts fade,  away, not just speaking in tongues.

INTERPRETATION ERRORS
Footnotes
1.	Notice that it is not the gift of tongues that is said to be "imperfect," "in part," or partial.  That is said of  "prophecy" and "knowledge."
a.	This does not refute the argument the gifts will fade away when Jesus returns.
b.	True that is said of "prophecy" and "knowledge", but is it said of tongues.
1 Cor. 13:8-9  Charity never faileth: but whether there be prophecies, they shall fail: whether there be tongues, they shall cease; whether there be knowledge, it shall vanish away
9  For we know in part, and we prophesy in part.
Here the scripture tells us that tongues just like the other gifts will fade away.  The question is when.  Furthermore, the scripture doesn't say that we speak in part because we don't.  We speak in complete ignorance.  We have no idea what we are saying.  Therefore, the fact that we don't speak in part has absolutely no bearing on this discussion.  So, why mention it in a context that implies that it has a bearing.

2.	1 Cor. 13:10  (KJ) But when that which is perfect is come (he, she or it; Jesus is come), then that which is in part (those things which we have a partial understanding of, those things which last for a short duration, prophesy, knowledge and tongues) shall be done away.

When all prophesies have been fulfilled, there won't be any use for prophesies about Jesus.  There won't be any need to speak in tongues about or to God when Jesus is physically present.  There, won't be any need to show the power of God through the gift of knowledge, when Jesus is with us.

1 Cor. 13:10  (GW) When the prophecies would come to fulfillment, when God's purpose would be accomplished, then "that which is perfect," or complete, would come (Jesus).
How does the fulfillment of all prophesies, the revealing of all knowledge and the understanding of all languages, imply that we are not talking about how long the gift of tongues will continue.

In summation, the book "Reasoning From The Scriptures" has failed to refute the argument that, the gifts of the spirit will last until that which is perfect is come.

3.	However, the Bible does indicate how long the ‘gift of tongues' would be a part of Christian experience.

3g.	Such a view agrees with the purpose of those gifts as stated at Hebrews 2:2-4
Heb. 2:2-4  For if the word spoken by angles was steadfast, and every transgression and disobedience received a just recompense of reward;

How shall we escape, if we neglect so great salvation; which at the first began to be spoken by the Lord, and was confirmed unto us by them that heard him;

God also bearing them witness, both with signs and wonders, and with divers miracles, and gifts of the Holy Ghost, according to his own will?

According to this scripture the purpose of the gifts was to bear witness to the truthfulness of God's Word.  Is there no longer a need to bear witness to that truthfulness.  More importantly, by the time all the people mentioned earlier died was there still such a need.