Sometimes we have lot's of pages to turn. One of the jobs of a good publisher is to choose the page turns wisely. Almost always they are on rests.
How many pages our music has depends on how complicated the parts are. For example, many sixteenths or 32nd notes take a lot of space.

Take a look at the Bach Chaconne here. From page 32 to 37 non-stop and no rests. To perform this piece you need to either memorize it, reduce the parts, get a page turner, get a stand that spreads on both sides or multiple stands. When I performed this on Swedish TV once I both memorized it and had reduced parts as a back up.

It's much tougher to find good page turn spots for Piano and Organ since they often have 3 staffs per line. What saves them is that they can continue to play with one hand while they turn with the other.

Usually the bowings are marked but only when it's not intended to be back and forth. In other words, if there will be two consecutive downs or ups, slurs, etc.

Concert master writes his or her own bowings, sometimes with a lot of changes and sometimes none, section players copy those bowings if they are not already written in by the librarian and the parts (bowings) are also passed on to the 2nd violins, violas, cellos and basses to try to match as well as possible.

@ Oliver - Memorizing parts is a great asset and should be done as much as possible especially when you play solo, regardless of the style of music.