What time of the day do you speak in tongues and how long?

Many would probably start their times of personal devotion this way where we allow the Holy Spirit to speak words of praise to the Father and as to how long we would do this would be up to each individual, where this could vary from about a minute to minutes.

I find it beneficial to speak in tongues while I am driving, if I sing in tongues in traffic I will usually have the window up. Even when we are walking down a beautiful country path where we can easily connect with the majesty of God, this can easily allow us to speak/sing in tongues to the Lord in praise.

I thoroughly enjoy praying and singing in tongues. I do it quite often sometimes for 30 minutes to a hour at a time sometimes longer.
Everyday I spend time doing it.

For me I do it all times during the day and evening.

I find that I pray in English the most as I enjoy engaging the mind in my prayers, i.e. enjoy talking to God, and understanding what the Holy Spirit is saying. But often times I just find I will be praying in tongues with out trying to, I will be praying in English then suddenly just notice I am praying in tongues.

As for when, and how long. I don't think it matters, as long as we spend time in God's presence. Whether it is English or tongues is irrelevant, as long as we are seeking God.

Paul said he spoke in tongues more than the others (I Cor 14:18) so he must have spoken often.

If you start looking at praying in tongues, or praying in general, as something to during a specific time, rather than just something to do or when you feel you should, you start to go down a slippery slope. you must be careful not to pray for the sake of praying, but rather for the reasons behind it.

Agreed. For me, it just happens. And it happens whenever I can't find the words to say about something, or even what thoughts to think. It's like some overload condition occurs inside me and I have to let something out of my mouth even if it sounds like complete rubbish. Often it has to do with asking for help figuring out a problem, or help with a personal fault. Yesterday I remember being in the shower, being bugged about something or other, having no clue even what kind of help to ask for, and suddenly, all on its own, under its own power, totally spontaneous, out comes this long, loud groan from my throat. And then... the frustration was gone. My guess is the Spirit grabbed it from me the instant the noise occurred. What he did with it, I have no clue. At this point, I can't even remember what it was all about, or even what it might have been about. That's how "gone" it went.

I'll guess that half the time tongues fire up inside me is when I'm thanking God for something he helped me with, and my stupid limited vocabulary doesn't come even close to getting it done. But again, it's never planned; it just seems to come alive out of nowhere. I'm thinking that's got to be the Spirit.