How big a handicap should I give my opponent?

Material odds depend on the rating of the person reviving odds, and the value increases with strength.
For example a knight to a beginner may only be worth 50 rating points.
A knight to a master is worth maybe 500-600 rating points.
Makes sense when you think about it, but it's also been tested.
---
Anyway, if he's really a beginner, material odds don't really work because they give all their pieces away in any case... I mean sure, you could do something extreme like give up both bishops and both knights, but that may make the game not fun for both sides.
There's one way to play that may be fun (and maybe not). Let them reverse the board a certain number of times. Like 3 times. So during the game, before they move, they have the option of turning the board around so now you play their side and they play yours.
This can help them learn what kinds of moves a stronger player would make to organize their position.
Material odds depend on the rating of the person reviving odds, and the value increases with strength.
For example a knight to a beginner may only be worth 50 rating points.
A knight to a master is worth maybe 500-600 rating points.
Makes sense when you think about it, but it's also been tested.
---
Anyway, if he's really a beginner, material odds don't really work because they give all their pieces away in any case... I mean sure, you could do something extreme like give up both bishops and both knights, but that may make the game not fun for both sides.
There's one way to play that may be fun (and maybe not). Let them reverse the board a certain number of times. Like 3 times. So during the game, before they move, they have the option of turning the board around so now you play their side and they play yours.
This can help them learn what kinds of moves a stronger player would make to organize their position.
or help them with moves while you play, to teach them a little

I'd say give him time odds. Bu then I guess I don't like losing because odds. If you do time do something like 10 to 2. It's actually not that easy to play with 2, though with 3 your are fine (I am talking in minutes).

One of my colleagues at work has recently started to play chess against me but he's a very weak player. He's never had a rating of any kind, but on here I'd guess he'd probably be somewhere in the 500-700 range given that I've won 9 out of 9 games with hardly any effort.
To even things up I'm going to suggest to him that I play with a handicap, but I'm not sure what would be appropriate. We don't play with time controls; the handicap needs to be material.
I'll find a balance through trial and error but to start with would a queen be too much?
Start with the queen and work your way down to comfortable odds.
One of my colleagues at work has recently started to play chess against me but he's a very weak player. He's never had a rating of any kind, but on here I'd guess he'd probably be somewhere in the 500-700 range given that I've won 9 out of 9 games with hardly any effort.
To even things up I'm going to suggest to him that I play with a handicap, but I'm not sure what would be appropriate. We don't play with time controls; the handicap needs to be material.
I'll find a balance through trial and error but to start with would a queen be too much?